Question

(3x-1)^3=-8/27

Answer 1

\(\left(3x-1\right)^3=-\dfrac{8}{27}\\ \Leftrightarrow3x-1=-\dfrac{2}{3}\\ \Leftrightarrow3x=\dfrac{1}{3}\\ \Leftrightarrow x=\dfrac{1}{9}\)

Answer 2

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

hay x=1/9

Answer 3

\(\left(3x-1\right)^3=-\left(\dfrac{2}{3}\right)^3\\ 3x-1=-\dfrac{2}{3}\\ 3x=-\dfrac{2}{3}+1\\ 3x=\dfrac{5}{3}\\ x=\dfrac{5}{3}:3\\ x=\dfrac{5}{9}\)

Answer 4

Ta có :

\(\left(3x-1\right)^3=\dfrac{-8}{27}\)

\(\left(3x-1\right)^3=\left(\dfrac{-2}{3}\right)^3\)

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

\(=>3x=1+\dfrac{-2}{3}\)

\(=>3x=\dfrac{1}{3}\)

\(=>x=\dfrac{1}{9}\)