$x^2+18x+2$

$\left(\sqrt[3]{a^2}b^2\right)\left(2\sqrt[4]{3a^3b}\right)$

$\frac{x^3}{x^2-4x+3}$

$\left(3x^4+3\right)^5\:\cdot\left(9x\right)^{7x}$

$\frac{\left(x^3+6x+5\right)}{x-4}$

$\frac{3x+6}{3}$

$-15\sqrt{m}+12\sqrt{n}-7\sqrt{n}+17\sqrt{n}-8\sqrt{m}+12\sqrt{m}$