$w^2+2w=15$
$x^2+33x+4=0$
$3xd\left(4a-5b\right)+5md\left(5b-4a\right)$
$\left(-9n+8b+21c\right)\left(-9n-21c+8b\right)$
$\lim_{x\to7}\left(\frac{x^2-49}{x+49}\right)$
$y^3+sy^2$
$\lim_{x\to0}\left(\frac{4x^2}{1-\cos^2\left(x\right)}\right)$
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