$b^2+50b+225$
$\left(x+4\right)^2\:-\left(x-2\right)^2-12x$
$2a^4+0a^3+3a^2-9a-7a^2-1$
$x^2+14x+9$
$4x^2x-12xy+9y^2$
$\int\frac{\sqrt{4x^2+49}}{x^3}dx$
$\left(-x^2\right)\left(2x^2+3x-1\right)$
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