Question

[Sarah Selena]

( x - 2 ) . ( x + 4 ) = 0

M. n giup minh voi

Answer 1

[Nguyễn Huy Tú]

\(\left(x-2\right)\left(x+4\right)=0\)

\(\Rightarrow x-2=0\) hoặc \(x+4=0\)

+) \(x-2=0\Rightarrow x=2\)

+) \(x+4=0\Rightarrow x=-4\)

Vậy \(x\in\left\{2;-4\right\}\)

Answer 2

[Lê Nguyên Hạo]

\(\left(x-2\right)\left(x+4\right)=0\)

\(\Rightarrow\left[\begin{matrix}x-2=0\\x+4=0\end{matrix}\right.\) \(\Rightarrow\left[\begin{matrix}x=0+2\\x=0-4\end{matrix}\right.\)

\(\Rightarrow\left[\begin{matrix}x=2\\x=-4\end{matrix}\right.\)

Vậy: \(x\in\left\{2;-4\right\}\)