Question

x³ - 9x² + 27x - 27 =  -8

Mọi ngừi cứu mình với

Answer 1

\(x^3-9x^2+27x-27=-8\)

\(\Rightarrow\left(x-3\right)^3=-8\)

\(\Rightarrow x-3=-2\Rightarrow x=1\)

Answer 2

\(x^3-9x^2+27x-27=-8\)

\(\Leftrightarrow x-3=-2\)

hay x=1