$\int\frac{11}{x\left(x+21\right)}dx$
$\left(x^2+x^4\right)\cdot\left(y+y^2\right)$
$a^2+8a-9$
$\int\frac{x^2+7x-6}{\left(x-1\right)\left(x+1\right)\left(2x-1\right)}\:dx$
$\left(c+f\right)\left(c-f\right)$
$a^2-4a-21=0$
$y=\frac{2}{3}x-6$
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