alleryThe expansion of (a + b + c)2 includes which terms?
Aab, bc, ca
B4ab, 4bc, 4ca
C2ab, 2bc, 2ca
D3ab, 3bc, 3ca
Answer & Solution
Correct answer: C. 2ab, 2bc, 2ca
1. Squaring a sum of three gives three squares and three products.
2. Each pair of letters appears twice in the expansion.
3. So the cross terms are 2ab, 2bc and 2ca.
4. The answer is 2ab, 2bc, 2ca.
_Source: syllabus Mathematics, Ch 4 'Exploring Algebraic Identities'_
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