$f\left(y\right)=\frac{x^3-9x}{x+3}$

$\left(n-6\right)\left(n-10\right)$

$\int\:\frac{1}{\sqrt{\left(x+2\right)^2+25}}dx$

$\int5x^4\sqrt{x^2+5}dx$

$-\frac{36}{-4}$

$10+3-\:\:4-5-\left[\:-3+1-\left(2-10\right)\:+4\right]\:-1-3$

$\int x\left(x^2+4\right)^{\frac{3}{2}}dx$