$\frac{x}{4}\:+\:\frac{y}{-3}=\:-1$
$x^2+42x+84$
$\lim_{x\to2}\left(\sqrt{x^2+2x}-\sqrt{x^2-2x}\right)$
$\lim_{u\to infinity}\left(\frac{u^2}{e^u-u-1}\right)$
$\frac{dy}{dx}=5x\left(y-2\right)^2$
$y'-4y=0.8$
$2\cdot2-12\cdot2+1$
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