$15-5\cdot2+4\cdot5$
$121x^2-144w^2$
$\left(p-7q\right)^2$
$4n^2-16x+16$
$2\left(-2\right)^3-5\left(-2\right)^2+7\left(-2\right)^5+5\left(-2\right)^2+\left(-2\right)-4$
$8ap^2-2a^2p+3p^2a+5ap$
$\lim_{x\to\infty}\left(\frac{x^2+7x+12}{x^2+6x-27}\right)$
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