What is the answer to -9|3x|=-81 ?

The answer to -9|3x|=-81 is x=-3\lor x=3

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-9|3x|=-81

- 9 ∣ 3 x ∣ = - 81

x = - 3 or x = 3

Solution steps

- 9 ∣ 3 x ∣ = - 81

Divide both sides by

- 9

∣ 3 x ∣ = 9

Apply absolute rule: If

∣ u ∣ = a, a > 0

then

u = a

u = - a

3 x = - 9 or 3 x = 9

3 x = - 9 or 3 x = 9

x = - 3 or x = 3

∣ - 5 + 5 a ∣ + 7 = 32

4 ∣ v - 5 ∣ + 10 = 18

x^{2} - 6 x - 4 = 0

\frac{b}{4} = 8

∣ 0.127 x + 9 ∣ = x^{2}