$\left(\sqrt{x}+2\:\sqrt{y}\right)^2$

$\lim\:_{x\to\:\infty\:}\left(\sqrt{4x^2-x+6}-2x+\frac{5}{4}\right)$

$\left(3x^{\frac{1}{5}}\left(\sqrt{x}+\sqrt{y}\right)\right)^{-1}$

$x^2-16x-36$

$9\left(y+1\right)$

$\left(-9xy^2-5x^2+14x+4\right)+\left(8x^2-5x+14x+6xy^2\right)+\left(3x^2+4x-3\right)$

$5n+6+\left(-7\right)$