Question

(1-2x)³ = -8

Giúp mình với nha

Answer 1

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

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

\(\Rightarrow1-2x=-2\)

\(\Rightarrow2x=3\)

\(\Rightarrow x=\dfrac{3}{2}\)

Answer 2

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

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

\(\Rightarrow1-2x=-2\)

\(\Rightarrow2x=1-\left(-2\right)\)

\(\Rightarrow2x=1+2\)

\(\Rightarrow2x=3\)

\(\Rightarrow x=\dfrac{3}{2}\)