Work Step by Step
Recall the difference of two squares formula: $(a-b)(a+b)=a^2-b^2$ By applying this formula, we get: $$ (3x + 4y)(3x - 4y)= (3x)^2-(4y)^2=9x^2-16y^2 .$$
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.