$\lim_{x\to-2}\left(\frac{\sqrt{6x+21}-3}{x+2}\right)$

$2\left(\sqrt{2}a^2b\right)\left(\sqrt{3}bx\right)$

$36\:+\:12m^2+\:m^4$

$\sqrt{2\cdot8}$

$4x^2-x^2-3$

$\lim_{x\to\infty}\left(\frac{ln\left(2\right)}{ln\left(x-1\right)+1}\right)$

$\left(\frac{1}{3}m+\frac{1}{3}n\right)^3$