Answer
$(6x+5y)^{2}$
Work Step by Step
$ 36x^{2}+60xy+25y^{2}\qquad$...recognize a perfect square trinomial.
$(A\pm B)^{2}=A^{2}\pm 2AB+B^{2}$;
$A=6x,\ B=5y$
$=(6x+5y)^{2}$
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