## Algebra 1: Common Core (15th Edition)

The answer is $(7p-3q)(7p+12q)$.
1. $49p^{2} + 63pq -36q^{2}$ 2. $49p^{2} + 84pq-21pq -36q^{2}$ 3. $7p(7p+12q) -3q(7p+12q)$ 4. $(7p-3q)(7p+12q)$.