$\lim_{x\to infinity}\left(\frac{20x}{\sqrt{4x^2+21}}\right)$
$-15+-7-\left(-15\right)$
$a=5,b=6$
$\frac{-4x+4}{2x+2}$
$9x^2-10x+25$
$\lim_{x\to3}\sqrt{3x-9}$
$\int\frac{x-1}{x\left(x+1\right)\left(x+2\right)}dx$
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