Answer
$(5y+2)^{2}$
Work Step by Step
$ 25y^{2}+20y+4\qquad$...recognize a perfect square trinomial.
$(A\pm B)^{2}=A^{2}\pm 2AB+B^{2}$; $A=5y,\ B=2$
$=(5y+2)^{2}$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.