Question

(2x \(-\) 1)³ = \(-\)8

Answer 1

\(=>(2x-1)^3=-2^3\)

\(=>2x-1=-2\)

\(=>2x=-2+1\)

\(=>2x= -1\)

\(=>x=-1:2\)

\(=>x=\) \(\dfrac{\text{-1}}{\text{2}}\)

Answer 2

$\text{(2}x - 1)$$^{3}=-8$

$\Leftrightarrow$ $\text{(2}x - 1)$$^{3} = -2$$^{3}$ 

$\Leftrightarrow$ $\text{2}x - 1 = -2$

$\Leftrightarrow$ $\text{2}x = -2 +1 $

$\Leftrightarrow$ $\text{2}x = -1 $

$\Leftrightarrow$ $\text{}x  = (-1) : 2 $

$\Leftrightarrow$ $\text{}x  = \dfrac{-1}{2}$