Answer
$y^2-49$
Work Step by Step
$(y+7)(y-7)=y\cdot y-7\cdot y+y\cdot 7-7\cdot 7=y^2-49$
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.