$x^2-30x$
$\lim_{x\to2}\left(\frac{5-\sqrt{3x+28}}{x+1}\right)$
$-n^3+-n^3-n^3$
$16x^2+2x+6$
$a+a^2+9a$
$\left(x+\frac{1}{2}\right)^2=\left(\sqrt{22}\right)^2$
$\int_7^{\infty}\left(\frac{1}{x^2-16}\right)dx$
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