Question

Tìm x biết: \(2x-x^3=0\)

Answer 1

\(2x-x^3=0\)

⇔ \(x\left(2-x^2\right)=0\)

⇔ \(\left[{}\begin{matrix}x=0\\2-x^2=0\end{matrix}\right.\)

⇔ \(\left[{}\begin{matrix}x=0\\x^2=2\end{matrix}\right.\)

⇔\(\left[{}\begin{matrix}x=0\\x=\sqrt{2}\\x=-\sqrt{2}\end{matrix}\right.\)

Answer 2

\(2x-x^3=0\)

\(x\left(2-x^2\right)=0\)

\(x=0\) hoặc \(2-x^2=0\)

\(x=0\) hoặc \(x=\sqrt{2}\) hoặc \(x=-\sqrt{2}\)

Vậy.........

Nhớ tick cho mình nha!