Question

Tìm x biết: (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

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

Answer 3

x=-2

x=4

Answer 4

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

TH1: x + 2 = 0                           TH2: x - 4 = 0

=> x = -2                                     => x = 4

Vậy x = -2 hoặc x = 4