$b^2-8b+7$
$\:y=2x\left(x+3\right)^2\:$
$\int\sec\left(\frac{2x}{3}\right)dx$
$x^3\cdot e^x^2$
$\lim_{x\to\infty}\left(\frac{6x^4-2x^2+5x}{3x-3x^2+3x^4}\right)$
$\lim_{x\to0}\left(\frac{x^2-x}{x\cdot x^2}\right)$
$\left(x-2.5\right)\left(x-5\right)$
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