$\left(a+4\right)\left(a+2\right)$
$\frac{11}{2x}-\frac{5}{8}=\frac{29}{8x}$
$15+2a-a^2$
$\lim_{x\to\infty}\left(\frac{n+1}{n}\right)^n$
$-8-9-16-1+134$
$\lim_{x\to\infty}\left(\frac{2x^2-2x+3}{x^2-6x-2}\right)$
$42-21+1-12+\left(12+8\right)$
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