$$x ^ { 3 } + 2 x ^ { 2 } - 4 x - 8 , 2 x ^ { 3 } + 7 x ^ { 2 } + 4 x - 4$$
$\left(x-2\right)\left(2x-1\right)\left(x+2\right)^{2}$
$$\left(x-2\right)\left(2x-1\right)\left(x+2\right)^{2}$$
$$2x^{4}+3x^{3}-10x^{2}-12x+8$$
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$\left(x-2\right)\left(x+2\right)^{2},\left(2x-1\right)\left(x+2\right)^{2}$