Question

Tìm x biết x²- 9*x=0

Answer 1

\(x^2-9x=0\\ \Rightarrow x\left(x-9\right)=0\\ \Rightarrow\left[{}\begin{matrix}x=0\\x-9=0\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=0\\x=9\end{matrix}\right.\)

Vậy \(x\in\left\{0;9\right\}\)

Answer 2

x2− 9x=0

⇒x (x − 9) = 0

⇒[x = 0x − 9 = 0

⇒[ x = 0x = 9

Vậy