$12x^3-15x^2+18x^5-21x^7$

$-3\left(-4\right)\frac{5}{4}\left(-7\right)$

$\left(x^2-8x\right)=\left(2x-10\right)\left(x+2\right)$

$8\left(\sqrt{-p+100}-36\right)$

$\left(y^3\sqrt{x^2y}\right)\left(z^3\sqrt{y^2}z\right)\left(x^3\sqrt{xz^2}\right)$

$\int\left(\frac{6x+17}{x^2+4x+5}\right)dx$

$\left(2x\:-\:4y^2\right)^4$