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Study Guides > College Algebra: Co-requisite Course

Radical Equations

Learning Objectives

  • Solve Radical Equations
    • Isolate a radical term in an equation using algebra and rules for radicals and exponents
    • Identify a radical equation with no solutions, or extraneous solutions
  • Applications with radical equations
    • Kinetic Energy
    • Volume
    • Free-fall
Now that you understand how to combine radical terms and expressions using algebraic operations, you can solve equations that contain radicals. Soon, we will be able to help Joan (and Anne) figure out how tall the ladder needs to be!  In this lesson you will use the addition and multiplication properties of equality as well as the rules for exponents. An equation that contains a radical expression is called a radical equation. Solving radical equations requires applying the rules of exponents and following some basic algebraic principles. In some cases, it also requires looking out for errors generated by raising unknown quantities to an even power.

Isolate a radical term

A basic strategy for solving radical equations is to isolate the radical term first, and then raise both sides of the equation to a power to remove the radical. (The reason for using powers will become clear in a moment.) This is the same type of strategy you used to solve other, non-radical equations—rearrange the expression to isolate the variable you want to know, and then solve the resulting equation. There are two key ideas that you will be using to solve radical equations. The first is that if [latex] a=b[/latex], then [latex] {{a}^{2}}={{b}^{2}}[/latex]. (This property allows you to square both sides of an equation and remain certain that the two sides are still equal.) The second is that if the square root of any nonnegative number x is squared, then you get x: [latex] {{\left( \sqrt{x} \right)}^{2}}=x[/latex]. (This property allows you to “remove” the radicals from your equations.) Let’s start with a radical equation that you can solve in a few steps:[latex] \sqrt{x}-3=5[/latex].

Example

Solve. [latex] \sqrt{x}-3=5[/latex]

Answer: Add 3 to both sides to isolate the variable term on the left side of the equation.

[latex] \begin{array}{r}\sqrt{x}-3\,\,\,=\,\,\,5\\\underline{+3\,\,\,\,\,\,\,+3}\end{array}[/latex]

Collect like terms.

[latex] \sqrt{x}=8[/latex]

Square both sides to remove the radical, since [latex] {{(\sqrt{x})}^{2}}=x[/latex]. Make sure to square the 8 also! Then simplify.

[latex]\begin{array}{r}{{(\sqrt{x})}^{2}}={{8}^{2}}\\x=64\end{array}[/latex]

Answer

[latex-display]x=64[/latex] is the solution to [latex] \sqrt{x}-3=5[/latex-display]

To check your solution, you can substitute 64 in for x in the original equation. Does [latex] \sqrt{64}-3=5[/latex]? Yes—the square root of 64 is 8, and [latex]8−3=5[/latex]. Notice how you combined like terms and then squared both sides of the equation in this problem. This is a standard method for removing a radical from an equation. It is important to isolate a radical on one side of the equation and simplify as much as possible before squaring. The fewer terms there are before squaring, the fewer additional terms will be generated by the process of squaring. In the example above, only the variable x was underneath the radical. Sometimes you will need to solve an equation that contains multiple terms underneath a radical. Follow the same steps to solve these, but pay attention to a critical point—square both sides of an equation, not individual terms. Watch how the next two problems are solved.

Example

Solve. [latex] \sqrt{x+8}=3[/latex]

Answer: Notice how the radical contains a binomial: [latex]x+8[/latex]. Square both sides to remove the radical.

[latex] {{\left( \sqrt{x+8} \right)}^{2}}={{\left( 3 \right)}^{2}}[/latex]

[latex] {{\left( \sqrt{x+8} \right)}^{2}}=x+8[/latex]. Now simplify the equation and solve for x.

[latex] \begin{array}{r}x+8=9\\x=1\end{array}[/latex]

Check your answer. Substituting 1 for x in the original equation yields a true statement, so the solution is correct.

[latex] \begin{array}{r}\sqrt{1+8}=3\\\sqrt{9}=3\\3=3\end{array}[/latex]

Answer

[latex] x=1[/latex] is the solution to [latex] \sqrt{x+8}=3[/latex].

In the following video example you will see two more examples that are similar to the ones above. https://youtu.be/tT0Zwsto6AQ

Example

Solve. [latex] 1+\sqrt{2x+3}=6[/latex]

Answer: Begin by subtracting 1 from both sides in order to isolate the radical term. Then square both sides to remove the binomial from the radical.

[latex] \begin{array}{r}1+\sqrt{2x+3}-1=6-1\\\sqrt{2x+3}=5\,\,\,\,\,\,\,\,\,\,\\{{\left( \sqrt{2x+3} \right)}^{2}}={{\left( 5 \right)}^{2}}\,\,\,\end{array}[/latex]

Simplify the equation and solve for x.

[latex] \begin{array}{r}2x+3=25\\2x=22\\x=11\end{array}[/latex]

Check your answer. Substituting 11 for x in the original equation yields a true statement, so the solution is correct.

[latex] \begin{array}{r}1+\sqrt{2(11)+3}=6\\1+\sqrt{22+3}=6\\1+\sqrt{25}=6\\1+5=6\\6=6\end{array}[/latex]

Answer

[latex] x=11[/latex] is the solution for [latex] 1+\sqrt{2x+3}=6[/latex].

Solving Radical Equations

Follow the following four steps to solve radical equations.
  1. Isolate the radical expression.
  2. Square both sides of the equation: If [latex]x=y[/latex] then [latex]x^{2}=y^{2}[/latex].
  3. Once the radical is removed, solve for the unknown.
  4. Check all answers.

Identify a radical equation with no solutions or extraneous solutions

Following rules is important, but so is paying attention to the math in front of you—especially when solving radical equations. Take a look at this next problem that demonstrates a potential pitfall of squaring both sides to remove the radical.

Example

Solve. [latex] \sqrt{a-5}=-2[/latex]

Answer: Square both sides to remove the term [latex]a–5[/latex] from the radical.

[latex] {{\left( \sqrt{a-5} \right)}^{2}}={{(-2)}^{2}}[/latex]

Write the simplified equation, and solve for a.

[latex]\begin{array}{r}a-5=4\\a=9\end{array}[/latex]

  Now check the solution by substituting [latex]a=9[/latex] into the original equation. It does not check!

[latex] \begin{array}{r}\sqrt{9-5}=-2\\\sqrt{4}=-2\\2\ne -2\end{array}[/latex]

Answer

No solution.

Look at that—the answer [latex]a=9[/latex] does not produce a true statement when substituted back into the original equation. What happened? Check the original problem: [latex]\sqrt{a-5}=-2[/latex]. Notice that the radical is set equal to [latex]−2[/latex], and recall that the principal square root of a number can only be positive. This means that no value for a will result in a radical expression whose positive square root is [latex]−2[/latex]! You might have noticed that right away and concluded that there were no solutions for a. But why did the process of squaring create an answer, [latex]a=9[/latex], that proved to be incorrect? The answer lies in the process of squaring itself. When you raise a number to an even power—whether it is the second, fourth, or 50th power—you can introduce a false solution because the result of an even power is always a positive number. Think about it: [latex]3^{2}[/latex] and [latex]\left(−3\right)^{2}[/latex] are both 9, and [latex]2^{4}[/latex] and [latex]\left(−2\right)^{4}[/latex] are both 16. So when you squared −2 and got 4 in this problem, you artificially turned the quantity positive. This is why you were still able to find a value for a—you solved the problem as if you were solving[latex] \sqrt{a-5}=2[/latex]! (The correct solution to [latex] \sqrt{a-5}=-2[/latex] is actually “no solution.”) Incorrect values of the variable, such as those that are introduced as a result of the squaring process are called extraneous solutions. Extraneous solutions may look like the real solution, but you can identify them because they will not create a true statement when substituted back into the original equation. This is one of the reasons why checking your work is so important—if you do not check your answers by substituting them back into the original equation, you may be introducing extraneous solutions into the problem. Have a look at the following problem. Notice how the original problem is [latex] x+4=\sqrt{x+10}[/latex], but after both sides are squared, it becomes [latex] {{x}^{2}}+8x+16=x+10[/latex]. Squaring both sides may have introduced an extraneous solution. In the following video we present more examples of solving radical equations by isolating a radical term on one side. https://youtu.be/qkZHKK77grM

Example

Solve. [latex] x+4=\sqrt{x+10}[/latex]

Answer: Square both sides to remove the term [latex]x+10[/latex] from the radical.

[latex] {{\left( x+4 \right)}^{2}}={{\left( \sqrt{x+10} \right)}^{2}}[/latex]

Now simplify and solve the equation. Combine like terms, and then factor.

[latex] \begin{array}{r}\left( x+4 \right)\left( x+4 \right)=x+10\\{{x}^{2}}+8x+16=x+10\\{{x}^{2}}+8x-x+16-10=0\,\,\,\,\,\,\,\,\,\,\,\,\,\,\\{{x}^{2}}+7x+6=0\,\,\,\,\,\,\,\,\,\,\,\,\,\,\\\left( x+6 \right)\left( x+1 \right)=0\,\,\,\,\,\,\,\,\,\,\,\,\,\,\end{array}[/latex]

Set each factor equal to zero and solve for x.

[latex] \begin{array}{c}\left( x+6 \right)=0\,\,\text{or}\,\,\left( x+1 \right)=0\\x=-6\text{ or }x=-1\end{array}[/latex]

Now check both solutions by substituting them into the original equation. Since [latex]x=−6[/latex] produces a false statement, it is an extraneous solution.

[latex] \begin{array}{l}-6+4=\sqrt{-6+10}\\\,\,\,\,\,\,\,\,-2=\sqrt{4}\\\,\,\,\,\,\,\,\,-2=2\\\text{FALSE!}\\\\\\-1+4=\sqrt{-1+10}\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,3=\sqrt{9}\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,3=3\\\text{TRUE!}\end{array}[/latex]

Answer

[latex]x=−1[/latex] is the only solution

It may be difficult to understand why extraneous solutions exist at all. Thinking about extraneous solutions by graphing the equation may help you make sense of what is going on. You can graph [latex]x+4=\sqrt{x+10}[/latex] on a coordinate plane by breaking it into a system of two equations: [latex]y=x+4[/latex] and [latex]y=\sqrt{x+10}[/latex]. The graph is shown below. Notice how the two graphs intersect at one point, when the value of x is [latex]−1[/latex]. This is the value of x that satisfies both equations, so it is the solution to the system. A straight line called y=x+4 and a curved line called y= the square root of x+10. The lines cross at the point (-1,3). Now, following the work we did in the example problem, let’s square both of the expressions to remove the variable from the radical. Instead of solving the equation [latex]x+4=\sqrt{x+10}[/latex]  we are now solving the equation [latex]\left(x+4\right)^{2}=\left(\sqrt{x+10}\right)^{2}[/latex] , or [latex]x^{2}+8x+16=x+10[/latex]. The graphs of [latex]y=x^{2}+8x+16[/latex] and [latex]y=x+10[/latex] are plotted below. Notice how the two graphs intersect at two points, when the values of x are [latex]−1[/latex] and [latex]−6[/latex]. An upward-sloping line that cross a parabola at two points. The line is called y=x+10. The parabola is called y=x squared + 8x +16. The line cross the parabola at the point (-6,4) and (-1,9). Although [latex]x=−1[/latex] is shown as a solution in both graphs, squaring both sides of the equation had the effect of adding an extraneous solution, [latex]x=−6[/latex]. Again, this is why it is so important to check your answers when solving radical equations!

Example

Solve. [latex] 4+\sqrt{x+2}=x[/latex]

Answer: Isolate the radical term.

[latex] \sqrt{x+2}=x-4[/latex]

Square both sides to remove the term [latex]x+2[/latex] from the radical.

[latex] {{\left( \sqrt{x+2} \right)}^{2}}={{\left( x-4 \right)}^{2}}[/latex]

Now simplify and solve the equation. Combine like terms, and then factor.

[latex] \begin{array}{l}x+2={{x}^{2}}-8x+16\\\,\,\,\,\,\,\,\,\,\,\,0={{x}^{2}}-8x-x+16-2\\\,\,\,\,\,\,\,\,\,\,\,0={{x}^{2}}-9x+14\\\,\,\,\,\,\,\,\,\,\,\,0=\left( x-7 \right)\left( x-2 \right)\end{array}[/latex]

Set each factor equal to zero and solve for x.

[latex] \begin{array}{c}\left( x-7 \right)=0\text{ or }\left( x-2 \right)=0\\x=7\text{ or }x=2\end{array}[/latex][latex] [/latex]

Now check both solutions by substituting them into the original equation. Since [latex]x=2[/latex] produces a false statement, it is an extraneous solution.

[latex] \begin{array}{r}4+\sqrt{7+2}=7\\4+\sqrt{9}=7\\4+3=7\\7=7\\\text{TRUE!}\\\\4+\sqrt{2+2}=2\\4+\sqrt{4}=2\\4+2=2\\6=2\\\text{FALSE!}\end{array}[/latex]

Answer

[latex]x=7[/latex] is the only solution.

In the next video we show another example of radical equations that have extraneous solutions. Always remember to check your answers for radical equations. https://youtu.be/y2yHPfuL0Hs In our last example we will use a difference of squares to solve a radical equation with two radicals. You will see that we have to isolate and eliminate one radical first, then tackle isolating and eliminating the other. We will also use factoring techniques for trinomials and the zero product principle to solve this equation.

Example

Solve [latex]\sqrt{2x+3}+\sqrt{x - 2}=4[/latex].

Answer: As this equation contains two radicals, we isolate one radical, eliminate it, and then isolate the second radical.

[latex]\begin{array}{ll}\sqrt{2x+3}+\sqrt{x - 2}\hfill& =4\hfill & \hfill \\ \sqrt{2x+3}\hfill& =4-\sqrt{x - 2}\hfill & \text{Subtract }\sqrt{x - 2}\text{ from both sides}.\hfill \\ {\left(\sqrt{2x+3}\right)}^{2}\hfill& ={\left(4-\sqrt{x - 2}\right)}^{2}\hfill & \text{Square both sides}.\hfill \end{array}[/latex]
Use the perfect square formula to expand the right side: [latex]{\left(a-b\right)}^{2}={a}^{2}-2ab+{b}^{2}[/latex].
[latex]\begin{array}{ll}2x+3\hfill& ={\left(4\right)}^{2}-2\left(4\right)\sqrt{x - 2}+{\left(\sqrt{x - 2}\right)}^{2}\hfill & \hfill \\ 2x+3\hfill& =16 - 8\sqrt{x - 2}+\left(x - 2\right)\hfill & \hfill \\ 2x+3\hfill& =14+x - 8\sqrt{x - 2}\hfill & \text{Combine like terms}.\hfill \\ x - 11\hfill& =-8\sqrt{x - 2}\hfill & \text{Isolate the second radical}.\hfill \\ {\left(x - 11\right)}^{2}\hfill& ={\left(-8\sqrt{x - 2}\right)}^{2}\hfill & \text{Square both sides}.\hfill \\ {x}^{2}-22x+121\hfill& =64\left(x - 2\right)\hfill & \hfill \end{array}[/latex]
Now that both radicals have been eliminated, set the quadratic equal to zero and solve.
[latex]\begin{array}{ll}{x}^{2}-22x+121=64x - 128\hfill & \hfill \\ {x}^{2}-86x+249=0\hfill & \hfill \\ \left(x - 3\right)\left(x - 83\right)=0\hfill & \text{Factor and solve}.\hfill \\ x=3\hfill & \hfill \\ x=83\hfill & \hfill \end{array}[/latex]
The proposed solutions are [latex]x=3[/latex] and [latex]x=83[/latex]. Check each solution in the original equation.
[latex]\begin{array}{l}\sqrt{2x+3}+\sqrt{x - 2}\hfill& =4\hfill \\ \sqrt{2x+3}\hfill& =4-\sqrt{x - 2}\hfill \\ \sqrt{2\left(3\right)+3}\hfill& =4-\sqrt{\left(3\right)-2}\hfill \\ \sqrt{9}\hfill& =4-\sqrt{1}\hfill \\ 3\hfill& =3\hfill \end{array}[/latex]
One solution is [latex]x=3[/latex]. Check [latex]x=83[/latex].
[latex]\begin{array}{l}\sqrt{2x+3}+\sqrt{x - 2}\hfill&=4\hfill \\ \sqrt{2x+3}\hfill&=4-\sqrt{x - 2}\hfill \\ \sqrt{2\left(83\right)+3}\hfill&=4-\sqrt{\left(83 - 2\right)}\hfill \\ \sqrt{169}\hfill&=4-\sqrt{81}\hfill \\ 13\hfill&\ne -5\hfill \end{array}[/latex]
The only solution is [latex]x=3[/latex]. We see that [latex]x=83[/latex] is an extraneous solution.

Answer

The only solution is [latex]x=3[/latex]

In our last video we show the solution for another radical equation that has square roots on both sides of the equation. Pay special attention to how you square the side that has the sum of a radical term and a constant. https://youtu.be/6fZgy6tZU6U

Applications with Radical Equations

Kinetic Energy

Roller Coaster view from sitting in a set on the roller coaster   One way to measure the amount of energy that a moving object (such as a car or roller coaster) possesses is by finding its Kinetic Energy. The Kinetic Energy ([latex]E_{k}[/latex], measured in Joules) of an object depends on the object’s mass (m, measured in kg) and velocity (v, measured in meters per second), and can be written as [latex] v=\sqrt{\frac{2{{E}_{k}}}{m}}[/latex].    

Example

What is the Kinetic Energy of an object with a mass of 1,000 kilograms that is traveling at 30 meters per second?

Answer: Identify variables and known values.

[latex]\begin{array}{l}E_{k}=\text{unknown}\\\,\,m=1000\\\,\,\,\,v=30\end{array}[/latex]

Substitute values into the formula.

[latex] 30=\sqrt{\frac{2{{E}_{k}}}{1,000}}[/latex]

Solve the radical equation for Ek.

[latex] \begin{array}{l}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{{\left( 30 \right)}^{2}}={{\left( \sqrt{\frac{2{{E}_{k}}}{1,000}} \right)}^{2}}\\\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,900=\frac{2{{E}_{k}}}{1,000}\\\\900\cdot 1,000=\frac{2{{E}_{k}}}{1,000}\cdot 1,000\\\\\,\,\,\,\,\,\,\,900,000=2{{E}_{k}}\\\\\,\,\,\,\,\,\,\,\frac{900,000}{2}=\frac{2{{E}_{k}}}{2}\\\\\,\,\,\,\,\,\,\,\,\,450,000={{E}_{k}}\end{array}[/latex]

Now check the solution by substituting it into the original equation.

[latex] \begin{array}{l}30=\sqrt{\frac{2\cdot 450,000}{1,000}}\\30=\sqrt{\frac{900,000}{1,000}}\\30=\sqrt{900}\\30=30\end{array}[/latex]

Answer

The Kinetic Energy is 450,000 Joules.

Here is another example of finding the kinetic energy of an object in motion. https://youtu.be/NbRXMihA1fY

Volume

Harvester ants found in the southwest of the U.S. create a vast interlocking network of tunnels for their nests. As a result of all this excavation, a very common above-ground hallmark of a harvester ant nest is a conical mound of small gravel or sand [footnote]Taber, Stephen Welton. The World of the Harvester Ants. College Station: Texas A & M University Press, 1998.[/footnote] Screen Shot 2016-07-29 at 6.22.47 PM The radius of  a cone whose height is is equal to twice it's radius is given as: [latex]r=\sqrt[3]{\frac{3V}{2\pi }}[/latex].  

Example

A mound of gravel is in the shape of a cone with the height equal to twice the radius. Calculate the volume of such a mound of gravel whose radius is 3.63 ft. Use [latex]\pi =3.14[/latex].

Answer: The radius of a cone given it's volume can be found with the following formula: [latex]r=\sqrt[3]{\frac{3V}{2\pi }}[/latex], [latex]r\ge 0\\[/latex] Cube both sides to eliminate the cube root.

[latex]\begin{cases}3.63 & =\sqrt[3]{\frac{3V}{2\pi }} \\(3.63)^3 =\left(\sqrt[3]{\frac{3\cdot V}{2\cdot 3.14}}\right)^3\\47.83=\frac{3V}{2\pi}\\47.83\cdot2\cdot3.14=3V\\100\approx{V}\end{cases}\\[/latex]

Therefore, the volume is about 100 cubic feet.

Answer

[latex-display]V\approx{100}\frac{\text{cu}}{ft}[/latex-display]

Here is another example of finding Volume given the radius of a cone. https://youtu.be/gssQYeV87u8

Free-Fall

Screen Shot 2016-07-29 at 6.18.23 PM When you drop an object from a height, the only force acting on it is gravity (and some air friction) and it is said to be in free-fall. We can use math to describe the height of an object in free fall after a given time because we know how to quantify the force of the earth pulling on us - the force of gravity. An object dropped from a height of 600 feet has a height, h, in feet after t seconds have elapsed, such that [latex]h=600 - 16{t}^{2}[/latex]. In our next example we will find the time at which the object is at a given height by first solving for t.

Example

Find the time is takes to reach a height of 400 feet by first finding an expression for t.

Answer: We are asked two things.  First, we will solve the height equation for t, then we will find how long it takes for the object's height above the ground to be 400 feet. Solve for t: [latex-display]\begin{array}{ccc}h=600 - 16{t}^{2}\\h-600=-16t^2\\\frac{h-600}{-16}=t^2\\\pm\sqrt{\frac{h-600}{-16}}=t\end{array}[/latex-display] At this point, let's stop and talk about whether it makes sense to include both [latex]\pm\sqrt{\frac{h-600}{-16}}[/latex].  We want time to be only positive since we are talking about a measurable quantity, so we will restrict our answers to just [latex]+\sqrt{\frac{h-600}{-16}}[/latex] We want to know at what time the height will be 400 ft., so we can substitute 400 for h. [latex-display]\begin{array}{ccc}\sqrt{\frac{400-600}{-16}}=t\\\sqrt{\frac{-200}{-16}}=t\\\sqrt{12.5}=t\\3.54=t\end{array}[/latex-display]

Answer

It takes 3.54 seconds for the object to be at a height of 400 ft.

 Analysis of the solution

We have made a point of restricting the radicand of radical expressions to non-negative numbers. In the previous example, we divided by a negative number, then took the square root to solve for t.  In this example is it possible to get a negative number in the radicand?  In other words, for what values for height would we have an issue where we may be taking the square root of a negative number?  We can use algebra to answer this question. Let's translate our question into an inequality.  Again, for what values of h would we get a negative quantity under the radical? The radicand is [latex]\frac{h-600}{-16}[/latex] so if we set up an inequality we can solve it for h: [latex-display]\begin{array}{ccc}\frac{h-600}{-16}\lt0\\-16\cdot\frac{h-600}{-16}\lt0\cdot{-16}\\h-600\gt0\\h\gt600\end{array}[/latex-display] We can interpret this as "when the height is greater than 600 ft. the radicand will be negative and therefore not a real number." If you re-read the question, you will see that heights greater than 600 don't even make sense, because the object starts at a height of 600 feet and is falling toward the ground, so height is decreasing. Understanding what domain our variables have is important in applications problems so we can get answers that make sense. Radical equations play a significant role in science, engineering, and even music. Sometimes you may need to use what you know about radical equations to solve for different variables in these types of problems.    

Licenses & Attributions

CC licensed content, Original

  • Kinetic Energy - Radical Equation Application. Authored by: James Sousa (Mathispower4u.com) for Lumen Learning. License: CC BY: Attribution.
  • Volume of a Cone -Radical Equation Application. Authored by: James Sousa (Mathispower4u.com) for Lumen Learning. License: CC BY: Attribution.
  • Revision and Adaptation. Provided by: Lumen Learning License: CC BY: Attribution.

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  • Ex 1: Solve a Basic Radical Equation - Square Roots. Authored by: James Sousa (Mathispower4u.com) . License: CC BY: Attribution.
  • Unit 18: Exponential and Logarithmic Functions, from Developmental Math: An Open Program. Provided by: Monterey Institute of Technology and Education Located at: https://www.nroc.org/. License: CC BY: Attribution.
  • Ex 2: Solve Radical Equations - Square Roots. Authored by: James Sousa (Mathispower4u.com) for Lumen Learning. License: CC BY: Attribution.
  • Ex 4: Solve Radical Equations - Square Roots. Authored by: James Sousa (Mathispower4u.com) . License: CC BY: Attribution.
  • Ex 7: Solve Radical Equations - Two Square Roots. Authored by: James Sousa (Mathispower4u.com). License: CC BY: Attribution.