Answer:
9x² + 24xy + 16y²
Step-by-step explanation:
(3x + 4y)²
= (3x + 4y)(3x + 4y)
each term in the second factor is multiplied by each term in the first factor.
3x(3x + 4y) + 4y(3x + 4y) ← distribute both parenthesis
= 9x² + 12xy + 12xy + 16y² ← collect like terms
= 9x² + 24xy + 16y²
