$49x^2+42x+49=\left(3x+7\right)^2$

$\lim_{x\to\infty}\left(\frac{\sqrt{x}-x}{x^2}\right)$

$log9q=log\left(4q-6\right)$

$18f^2-12f+2$

$\frac{x+3}{4}=\frac{2x-1}{7}$

$\lim_{x\to\infty}\left(\left(\sqrt[3]{x^3+x}-\sqrt[3]{x^3+1}\right)\right)$

$\frac{dy}{dx}=\frac{4xy}{\left(ln\left(y\right)\right)^{10}}$