Answer
$(s+2t-2p)(s+2t+2p)$
Work Step by Step
Using the fact that $a^2-b^2=(a+b)(a-b)$, $$(s+2t)^2-4p^2=(s+2t)^2-(2p)^2=(s+2t-2p)(s+2t+2p)$$
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.