$\frac{81-x^4}{9-x^2}$
$-k+4k=21$
$x^2-7+12.25$
$\left(3x-8\right)\left(x-3\right)$
$\frac{d}{dx}\left(\frac{x^{\frac{\:3}{2\:}}\sqrt{x^2+1}}{\left(2x+1\right)^3\:}\right)$
$2x^2-6x-8=0$
$\frac{x^3+1}{x^2-2x}$
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