Question

(x - 42) . (x - 12) = 0

Answer 1

\(\left(x-42\right)\left(x-12\right)=0\)

\(\Rightarrow x-42=0\) hoặc \(x-12=0\)

\(\Rightarrow x=42\) hoặc \(x=12\)

 

 

Answer 2

`(x - 42) . (x - 12) = 0`

`=>` \(\left[{}\begin{matrix}x-42=0\\x-12=0\end{matrix}\right.\)

`=>` \(\left[{}\begin{matrix}x=0+42\\x=0+12\end{matrix}\right.\)

`=>` \(\left[{}\begin{matrix}x=42\\x=12\end{matrix}\right.\)