Answer:
x² + 8x + 16
Step-by-step explanation:
(x + 4)²
= (x + 4)(x + 4)
Each term in the second factor is multiplied by each term in the first factor, that is
x(x + 4) + 4(x + 4) ← distribute parenthesis
= x² + 4x + 4x + 16 ← collect like terms
= x² + 8x + 16
