$$\left. \begin{array} { l } { 4 x - 20 , x ^ { 2 } - 25 , x ^ { 2 } - 3 x - 10 } \\ { x ^ { 2 } + 4 x + 4 , x ^ { 2 } - 4 , x ^ { 2 } + 8 x + 1 } \end{array} \right.$$
$4\left(x-2\right)\left(x^{2}-25\right)\left(x+2\right)^{2}\left(x^{2}+8x+1\right)$
$4\left(x-5\right),\ x^{2}-25,\ x^{2}-3x-10,\ \left(x+2\right)^{2},\ x^{2}-4,\ x^{2}+8x+1$
