$\left(1+3u\right)\left(3+\sqrt{-25}\right)$

$\left(-2\right).\left(-4\right)-\left(-3\right).\left(-4\right)$

$\frac{4abx^3}{2bx^2}$

$\frac{d}{dx}\left(\left(x-1\right)^4\left(2x+3\right)\right)$

$\frac{\left(\frac{x-2a^2-2x^2}{2\sqrt{a^2+x^2}}\right)}{x}$

$216x^3-y^6$

$2+3+5+4+7+3+5+8$