\(\left(x-2\right)\left(c+4\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-2=0\\x+4=0\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=2\\x=-4\end{cases}}\)
\(\left(x-2\right).\left(x+4\right)=0\)
\(\Rightarrow x-2=0\text{ hoặc }x+4=0\)
\(\Rightarrow x=2\text{ hoặc }x=-4\)