$$x ( x + 1 ) + 2 ( x + 1 )$$
$\left(x+1\right)\left(x+2\right)$
$$x^{2}+x+2\left(x+1\right)$$
$$x^{2}+x+2x+2$$
$$x^{2}+3x+2$$
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$x^{2}+3x+2$