a) \(\Rightarrow8x\left(x-2\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=0\\x=2\end{matrix}\right.\)
b) \(\Rightarrow\left(x-4\right)\left[1-2\left(x-4\right)\right]=0\)
\(\Rightarrow\left(x-4\right)\left(9-2x\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=4\\x=\dfrac{9}{2}\end{matrix}\right.\)
c) \(\Rightarrow x\left(x-5\right)-4\left(x-5\right)=0\)
\(\Rightarrow\left(x-5\right)\left(x-4\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=5\\x=4\end{matrix}\right.\)
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