$x2+7x+9=0$
$4x^2+36x+9$
$\left(2x\:+3\right)\cdot4x$
$\frac{6}{\left(3+x\right)^3}$
$\left(-12x+9\right)\left(12x+9\right)$
$\left(a^5-1\right)\left(a^{10}+a^5+1\right)$
$\lim_{x\to-1}\left(\frac{x^2-x+2}{x^2+2x+1}\right)$
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