$x^2-24x+144$
$16x^2-40x+25$
$x^2+22x+121$
$4x^4-29x^2+25$
$m^2+4mn+4n^2$
$x^2+x+\frac{1}{4}$
$4+4a+a^2$
Factor the expression.
See formulas (1)
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