$x^2\:+\:13x\:-\:13\:$
$y=e^{-ex}+x^{-e}$
$4b=3b+b$
$\lim_{x\to-\infty}\left(\frac{x-2}{x^2+3x-4}\right)$
$\left(x-1\right)\left(x+1\right)\left(x^2+b\right)$
$24\cdot24$
$2\left(x^2+10\right)+5x$
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