$1x^2-2x+5$
$4m^2-81$
$\frac{x^{15}}{x^4}+x+1$
$36x^2+120x+14$
$4\cdot\left(x-3\right)-6x+7<x+13$
$\lim_{x\to-1}\left(\frac{3x^4+4x^3+4x+5}{x+1}\right)$
$\lim_{u\to-\infty}\left(\frac{8u-21}{2u^4+2u^2+\pi}\right)$
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