Question

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

Answer 1

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

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

Answer 2

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

*TH1:x-2=0

x=2

*TH2: x+4 =0

x= -4

Vậy x\(\in\) {-4;2}