What is the integral of x*sqrt(1+4x^2) ?

The integral of x*sqrt(1+4x^2) is 1/12 (1+4x^2)^{3/2}+C

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integral of x*sqrt(1+4x^2)

\int x \cdot 1 + 4 x^{2} d x

\frac{1}{12} (1 + 4 x^{2})^{\frac{3}{2}} + C

Solution steps

\int x 1 + 4 x^{2} d x

Apply u-substitution

= \int \frac{u}{8} d u

Take the constant out:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

= \frac{1}{8} \cdot \int u d u

Apply the Power Rule

= \frac{1}{8} \cdot \frac{2}{3} u^{\frac{3}{2}}

Substitute back

u = 1 + 4 x^{2}

= \frac{1}{8} \cdot \frac{2}{3} (1 + 4 x^{2})^{\frac{3}{2}}

Simplify

\frac{1}{8} \cdot \frac{2}{3} (1 + 4 x^{2})^{\frac{3}{2}} : \frac{1}{12} (1 + 4 x^{2})^{\frac{3}{2}}

= \frac{1}{12} (1 + 4 x^{2})^{\frac{3}{2}}

Add a constant to the solution

= \frac{1}{12} (1 + 4 x^{2})^{\frac{3}{2}} + C

What is the integral of x*sqrt(1+4x^2) ?
The integral of x*sqrt(1+4x^2) is 1/12 (1+4x^2)^{3/2}+C