$b^2-20b+100$
$2x^2-8x^4+14x^6$
$3x^3-6x+27x^2$
$x+3\left(x^3+5x^2+13x+27\:\right)$
$5x^2+13x+12=0$
$\left(4z+2\sqrt{z}-2\right)\left(2\sqrt{z}+5\right)$
$-\left(-3\right)^2$
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