Answer:
a² + 2ab + b²
Explanation:
(a + b)² = (a + b)(a + b)
multiply each term in the second factor by each term in the first factor
=a(a + b) + b(a + b) ← distribute both parenthesis
= a² + ab + ab + b² ← collect like terms
= a² + 2ab + b²
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