What is the answer to |3x|=12 ?

The answer to |3x|=12 is x=-4\lor x=4

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|3x|=12

∣ 3 x ∣ = 12

x = - 4 or x = 4

Solution steps

∣ 3 x ∣ = 12

Apply absolute rule: If

∣ u ∣ = a, a > 0

then

u = a

u = - a

3 x = - 12 or 3 x = 12

3 x = - 12 or 3 x = 12

x = - 4 or x = 4

x^{3} - 13 x - 12

(\frac{x}{3})^{3}

2 x^{3} - 5 x^{2} - 28 x + 15

3 x - 5 = 7 x - 17

\frac{5}{6} = \frac{x}{24}