$\left(4x-4\right)\left(4x-25\right)$
$121x^2-25$
$m^4\:+\:5m^2\:+\:4$
$100-16x^2$
$4x+22=86$
$\left(3a^x-5y^m\right).\left(3a^x+5y^m\right)$
$\left(4a+ab\right)^2$
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