$21^4$
$\left(2x+1\right)\left(2x-1\right)+\left(x+3\right)\left(x-3\right)$
$q=p^2-40p+400$
$\frac{2x^4-8x^3+4x^2-11x-1}{x^2-1}$
$\left(5+x\right)\left(x+b\right)$
$2x-y+2z=2$
$24\:\frac{dy}{dx}+6y+240$
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