## Introductory Algebra for College Students (7th Edition)

$$49x^{2} - 16y^{2}$$
We use the FOIL method to evaluate this expression. We multiply each term within the first set of parentheses with each term within the second set of parentheses: $$49x^{2} + 28xy - 28xy - 16y^{2}$$ Now, we combine like terms: $$49x^{2} - 16y^{2}$$