$\left(\:2a\:+7b\right)\:\left(\:2a\:-\:7b\right)$
$\frac{x^4}{\left(x^2+1\right)^2}$
$\frac{19}{2x-10}\le-5$
$\lim_{x\to\infty}\left(\frac{11x}{11x+5}\right)^{5x}$
$85x^3+20x$
$\lim_{x\to infinity}\left(x+1-x^2\right)$
$5x+11-7x+9-13x+4x-8$
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