Answer
$(3y+8)^{2}$
Work Step by Step
$ 9y^{2}+48y+64\qquad$...recognize a perfect square trinomial.
$(A\pm B)^{2}=A^{2}\pm 2AB+B^{2}$;
$A=3y,\ B=8$
$=(3y+8)^{2}$
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