a,\(2x^2-8x=0\)

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

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

b,\(B\left(x\right)=\left(2x^2-8x\right)-\left(3x+2x^2\right)\)

\(=2x^2-8x-3x-2x^2\)

=\(-11x\)

c,\(-11x=0\)

\(\Rightarrow x=0\)