Question

Tìm x: (3x - 2)³ = -27

Answer 1

(3x - 2)³ = -27

3x - 8 = -27

3x = -27 +8

3x = -19

x = -19 : 3

x = -6,3

Vậy x = -6,3

Answer 2

\(\left(3x-2\right)^3=-27\Leftrightarrow\left(3x-2\right)^3=\left(-3\right)^3\)

\(\Leftrightarrow3x-2=-3\Leftrightarrow3x=-1\Leftrightarrow x=\dfrac{-1}{3}\)