Question

$x^3-9x=0$

Answer 1

\(\Leftrightarrow x\left(x-3\right)\left(x+3\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=3\\x=-3\end{matrix}\right.\)

Answer 2

tham khảo

a) x 3 − 9 x = 0

⇔ x ( x 2 − 9 ) = 0

⇔ x ( x − 3 ) ( x + 3 ) = 0

⇔ ⎡ ⎢ ⎣ x = 0 x − 3 = 0 x + 3 = 0

⇔ ⎡ ⎢ ⎣ x = 0 x = 3 x = − 3