Question

(2x-1)^3=-8 cứu mình với

Answer 1

\(\left(2x-1\right)^3=-8\)

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

\(2x-1=-2\)

\(2x=-2+1\)

\(2x=-1\)

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

Answer 2

(2.x-1)³=-8

=> (2.x-1)³=(-2)³

=> 2.x-1=-2

=> 2.x=-1

=> x=-0,5

Answer 3

\(\left(2x-1\right)^3=-8\\ \Rightarrow\left(2x-1\right)^3=-2^3\\ \Rightarrow2x-1=-2\\ \Rightarrow2x=-2+1=-1\Rightarrow x=-\dfrac{1}{2}\)