$\lim_{x\to2}\left(\frac{\sqrt{x+4}-\sqrt{2}}{x+2}\right)$
$6x^2-5x-1$
$\lim_{x\to3}\left(7x-2\right)\cdot\left(-2x^2+5\right)$
$3x^2-7x+25=0$
$\left(0.7-x\right)\left(0.49+x\right)$
$\frac{dy}{dx}=e^{-15x},\:y\left(0\right)=17$
$4x+y=9$
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