$3x^2+12x+15$
$\left(r^2+2\right)^2$
$\left(-30\right)\left(7\right)\left(-4\right)$
$\left(3x\:+8\right)\left(x+6\right)$
$8x^2+3x+2$
$x^2-9x-22$
$\frac{4x^6+2x^5+2x^4}{2x^2}$
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