Question

giá trị của x thỏa mãn (2x-1)³ = -8

Answer 1

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

\(\Leftrightarrow2x-1=-2\)

\(\Leftrightarrow2x=-1\)

\(\Leftrightarrow x=-\frac{1}{2}\)

Answer 2

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

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

\(\Rightarrow2x-1=3\)

\(\Rightarrow2x=4\)

\(\Rightarrow x=2\)

Vậy x = 2

Answer 3

(2x-1)³ = -8

<=>(2x-1)³=(-2)³

<=>2x-1=-2

<=>2x=-1

<=>x=-1/2

Answer 4

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

\(\left(2x-1\right)^3=-\sqrt[3]{8}\)

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

\(2x=-1\)

\(x=-1:2\)

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