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What is the difference between ( (m+n)^2 ) and (m^2+n^2)?

Answer and explanation

Correct answer: (2mn)

The direct answer is option B: \\(2mn\\). To see why, expand the square as multiplication: \\(m+n\\)^2=(m+n)(m+n)\\). The four products are \\(m^2\\), \\(mn\\), \\(nm\\), and \\(n^2\\). Since \\(mn=nm\\), the two middle products combine to \\(2mn\\). Thus \\(m^2+2mn+n^2\\) is obtained. Compared with only \\(m^2+n^2\\), the additional part is exactly \\(2mn\\). Option A is wrong because the expressions are generally different; they are equal only in special cases such as \\(mn=0\\), not as an identity. Option B is correct because it gives the missing middle term. Option C has the wrong sign and belongs to the square of a difference. Option D has only one \\(mn\\), although two cross-products occur. Exam cue: whenever a sum is squared, add twice the product of the two terms.

Related tags

Common ErrorSquare IdentityExtra Term

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