Work Step by Step
We distribute to obtain: $$ (x + y)(x - y)= x^2-xy+xy-y^2=x^2-y^2 .$$ Note that this is the difference of two squares formula: $(a-b)(a+b)=a^2-b^2$
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.