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Apart from (a^2+b^2+c^2), what part is added in ( (a+b+c)^2 )?

Answer and explanation

Correct answer: (2ab+2bc+2ca)

The direct answer is option B: \\(2ab+2bc+2ca\\). Expand the square by multiplying \\(a+b+c\\) by itself. Each term first multiplies every term in the second bracket: the square terms are \\(a^2,b^2,c^2\\). The unlike pairs occur twice: \\(ab+ba=2ab\\), \\(bc+cb=2bc\\), and \\(ca+ac=2ca\\). Therefore, \\(a+b+c\\)^2=a^2+b^2+c^2+2ab+2bc+2ca\\). Option B is correct because it contains the double product for every pair. Option A gives only one copy of each pair and therefore misses a factor of 2. Option C is wrong because \\(abc\\) is a product of three terms and belongs to cubic-type expressions, not this square expansion. Option D is wrong because the original sum itself is not the extra part produced by squaring. Remember: square of three terms means three squares plus twice each of the three pairwise products.

Related tags

Three Term IdentityAbc SquareDouble Products

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