$$( x + 2 ) ( x ^ { 2 } + 25 ) - 10 x ^ { 2 } - 20 x$$
$\left(x+2\right)\left(x-5\right)^{2}$
$$x^{3}+25x+2x^{2}+50-10x^{2}-20x$$
$$x^{3}+25x-8x^{2}+50-20x$$
$$x^{3}+5x-8x^{2}+50$$
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$x^{3}-8x^{2}+5x+50$
