$36x^2+24x+4$

$\int\frac{\left(x^2-2x-3\right)}{\left(x^2+1\right)\left(x+1\right)}dx$

$3\left(4b-5n\right)-15\left(5n+4b\right)$

$\lim\:_{x\to\:-\infty\:\:}-\left(0.25\right)^{-x+1}+5$

$\lim_{x\to8}\left(\frac{-2x^2+25x-27}{x-8}\right)$

$\lim_{x\to0}\left(\frac{x^3+x^2+6x}{x^2-2x}\right)$

$\frac{dy}{dx}\cdot2+y=12$