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The algebraic identity (a + b)² is equal to:

Aa² + b²
Ba² − 2ab + b²
Ca² + 2ab + b²
Da² + ab + b²
Answer & Solution
Correct answer: C. a² + 2ab + b²
By expanding: (a + b)² = (a + b)(a + b) = a² + ab + ba + b² = a² + 2ab + b². This holds for all real values of a and b.
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