(2p+1)(2p+1) or (2p+1)^2
To get the final answer, just take the top two numbers and the bottom two numbers. In this case, though, both are the same; the top two and the bottom two are the same so the answer will just be (2p+1)^2.
To make sure it is right, multiply the top two and bottom two and add them and it should give you 4p. This is the way, I learned to do it but there are other ways, too. I hope this helps you! Let me know because my explanation might be confusing! Good Luck! : )