Simplify (4y + 9)² using the square of a binomial formula.
Question:
Simplify (4y + 9)² using the square of a binomial formula.
Choices:
- 16y² + 72y + 81
- 10y² + 72y + 81
- 121y² + 81
- 16y² + 72y + 81
Answer:
16y² + 72y + 81