Question

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

M. n giup minh voi

Answer 1

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

\(\Rightarrow x-2=0\) 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

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

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

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

Vậy: \(x\in\left\{2;-4\right\}\)

Answer 3

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

=> hoặc x - 2 = 0 hoặc x + 4 = 0

x - 2 = 0 x = 0 + 2 x = 2

x + 4 = 0 x = 0 - 4 x = -4

Vậy x = 2 hay x = - 4

Answer 4

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

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

Answer 5

x=2 hoặc x=4

Answer 6

x=2 x=4