$\lim\:_{x\to\:\:-1}\left(\frac{7x^4+5x^3+5x+3}{x+1}\right)$

$\frac{40m^3n^2-20m^2n^3}{20m^2n^2}$

$\frac{dy}{dx}=\frac{1}{9}\left(y\right)\left(y+2\right)$

$\lim_{x\to0}\left(\frac{1}{ln\left(1\right)}\right)$

$\left(4b^{-3}+2\right)^3$

$\frac{8x^2+6x-12}{x+4}$

$x^2-11x-30\:$