$\left(-x-2y\right)\left(-x+2y\right)$

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

$\lim_{x\to\infty}\sqrt{\left(x+1\right)^2-8}-\sqrt{x^2-8}$

$\left(m^2-15\right)\left(m^2+7\right)$

$\lim_{x\to\infty}\ln\left(3-2x^2\right)-\ln\left(-2+x-x^2\right)$

$24x^2-38x+15$

$-3\cdot\left(-5\right)^2+5\cdot\left(\sqrt[3]{-27}\right)^0$