Work Step by Step
$ (2x + y + 1)^2$ $=(2x + y + 1)(2x + y + 1)$ $=4x^2+2xy+2x+2xy+y^2+y+2x + y + 1$ $=4x^2+4x+4xy+2y+y^2+1$
You can help us out by revising, improving and updating this answer.Update this answer
After 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.