alleryThe expansion of (a - b)2 is:
Aa2 - 2ab - b2
Ba2 + 2ab - b2
Ca2 - 2ab + b2
Da2 + 2ab + b2
Answer & Solution
Correct answer: C. a2 - 2ab + b2
1. The identity mirrors the one for (a + b)2.
2. Only the sign of the middle term changes.
3. So (a - b)2 is a2 - 2ab + b2.
4. The answer is a2 - 2ab + b2.
_Source: syllabus Mathematics, Ch 4 'Exploring Algebraic Identities'_
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