$\frac{2x^2-6x+4}{x+5}$

$\frac{dy}{dx}=\left(y+5\right)\left(x+2\right)$

$\left(7+s\right)\left(7-s\right)$

$\left(\:8\:-\:\left(-4\right)\:+\:\left(-8\right)\right)\:.\:\left(\:\left(-5\right)\:-8\:+\left(-6\right)\right)$

$\int x^4\cdot ae^{-ax}dx$

$2x\sqrt{2}$

$2^2-21a+20$