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What is the middle term in ( (3a+2b)^2 )?

Answer and explanation

Correct answer: (12ab)

The identity \\(p+q)^2=p^2+2pq+q^2\\) shows that the middle term is twice the product of the two terms. Here, take \\(p=3a\\) and \\(q=2b\\). The middle term is therefore \\(2(3a)(2b)=12ab\\). The complete expansion is \\(9a^2+12ab+4b^2\\), so the central term is the term containing both variables.

Thus option C, \\(12ab\\), is correct. Option B is the square of the first term, \\(9a^2\\), and option D is the square of the second term, \\(4b^2\\); neither is the middle term. Option A would result from missing a factor of 2. Keeping the order of the identity clear prevents that common error.

Related tags

Middle TermBinomial SquareAlgebra

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