Question

Answer 1

\(\left(x+2\right)\left(x-7\right)=0\)

\(\left[{}\begin{matrix}x+2=0\\x-7=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=-2\\x=7\end{matrix}\right.\)

Answer 2

1(x-2).(x-7)

 

Answer 3

\(1,\Leftrightarrow\left(x-7\right)\left(x+2\right)=0\Leftrightarrow\left[{}\begin{matrix}x=7\\x=-2\end{matrix}\right.\\ 2,\Leftrightarrow3x\left(x^2-25\right)=0\\ \Leftrightarrow3x\left(x-5\right)\left(x+5\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=0\\x=5\\x=-5\end{matrix}\right.\)