$\left(n+6\right)\left(n-6\right)+\left(n+6\right)^2$
$\left(3+t\right)^2$
$3x^2=25\:\:\:5x^2=9y$
$25x^2-40x$
$\lim_{x\to\infty}\left(8^{x-3}\right)$
$9c^2+c+25$
$\frac{dy}{dt}=-4y^4,\:y\left(0\right)=-3$
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