Answer:
see explanation
Step-by-step explanation:
(4 - 7y)(7 + 4y)
Each term in the second factor is multiplied by each term in the first factor, that is
4(7 + 4y) - 7y(7 + 4y) ← distribute parenthesis
= 28 + 16y - 49y - 28y² ← collect like terms
= 28 - 33y - 28y² or
- 28y² - 33y + 28 ← in standard form
