$-75\cdot0$

$\int\:\frac{x^4+3x+21}{\sqrt{x}}dx$

$\lim_{x\to\infty}\left(\frac{4x+8}{7x^2-8x+8}\right)$

$\int\left(8x-5\right)\left(4x^2-5x+2\right)^3dx$

$\left(3a^2-2a+4\right)\left(3a^2-a\right)$

$-\left(3+5-6\right)-4-\left(-5-6+7-2\right)$

$\int s\left(s-3\right)ds$