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What is the difference between ( (x+1)^2 ) and (x^2+1)?

Answer and explanation

Correct answer: (2x)

The direct answer is B: the difference is 2x. Use the identity \\((p+q)^2=p^2+2pq+q^2\\) with p=x and q=1. Thus \\((x+1)^2=x^2+2x+1\\. Subtract the second expression: \\((x^2+2x+1)-(x^2+1)=2x\\. Option B is correct because the x² terms cancel and the constant 1 terms also cancel. Option A, x, misses the required middle-term coefficient 2. Option C, 1, ignores the middle term and is only a constant. Option D, x², fails because x² appears in both expressions and therefore cancels. This explanation treats “difference” as the first expression minus the second; if the reverse order were intended, it would be -2x. Exam cue: never forget the middle term in a square.

Related tags

Middle TermCommon MistakeBinomial Square

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