\(1,\left(5-2x-16\right)\left(5-2x+16\right)=0\\\left(-2x-11\right)\left(-2x+21\right)=0\\\left[{}\begin{matrix}-2x-11=0\\-2x+21=0\end{matrix}\right.=>\left[{}\begin{matrix}x=-\dfrac{11}{2}\\x=\dfrac{21}{2}\end{matrix}\right. \)
\(2,x^2-4x+4-25=0\\ \left(x-2\right)^2-25=0\\ \left(x-2-5\right)\left(x-2+5\right)=0\\ \left(x-7\right)\left(x+3\right)=0\\ \left[{}\begin{matrix}x-7=0\\x+3=0\end{matrix}\right.=>\left[{}\begin{matrix}x=7\\x=-3\end{matrix}\right.\)
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