$\lim_{x\to4}\left(\frac{2x^2-2x-8}{x-4}\right)$
$2x^2-4x-30$
$\left(5^3x^2y^4\right)^0$
$2x\:+\:18y\:and\:2\left(x\:+\:9y\right)$
$x^2-x+72$
$\lim_{x\to1}\left(\frac{x^2+7x-2}{x^2-3x+2}\right)$
$\frac{2}{2\sqrt{2x}}+\frac{3}{3\sqrt[3]{3x^2}}$
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