$16-36a^2$
$4x^2+4\cdot1$
$16b^2-169c^6$
$x^2-18x-81$
$\left(x^2\right)^2\left(-5y\right)^2$
$\left(y^2-y+1\right)\left(y^2-y-1\right)$
$a^2-a+30$
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