$x^2-4x-5=\left(x-n\right)^2-m$
$60+80+91$
$r^2-8r-7$
$\lim_{x\to0}\left(\frac{\sqrt{8x^3-27}}{4x^2-9}\right)$
$3x^2-6x-3$
$\lim\:_{x\to\:\infty\:}\left(\sqrt{x+\sqrt{x}}-\sqrt{x}\right)\:$
$3x^2+2x^2+x$
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