$\lim_{x\to\infty}\sqrt{x^2+x+1}-\sqrt{3x^2-1}-3x$
$640-10x^2$
$x^2-9^2+81$
$\frac{dy}{dt}=6y$
$\frac{2x^2-5x+2}{2x-1}$
$3\left(x-2\right)^2\left(x+6\right)=3\left(x+1\right)^2\left(x-1\right)+3$
$\lim_{x\to-1}\left(\sqrt{x+\sqrt{x+8}}\right)$
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