Answer
$(4x-5)^{2}$
Work Step by Step
$ 16x^{2}-40x+25\qquad$...recognize a perfect square trinomial.
$(A\pm B)^{2}=A^{2}\pm 2AB+B^{2}$;
$A=4x,\ B=5$
$=(4x-5)^{2}$
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