The expansion of (a + b)2 is:
Aa2 + 2ab - b2
Ba2 + 2ab + b2
Ca2 - 2ab + b2
Da2 + ab + b2
Answer & Solution
Correct answer: B. a2 + 2ab + b2
1. Write (a + b)(a + b) and use the distributive property.
2. That gives a2 + ab + ba + b2.
3. The two middle terms combine to 2ab.
4. So the answer is a2 + 2ab + b2.
_Source: NCERT Class 9 Mathematics, Ch 4 'Exploring Algebraic Identities'_
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