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What is the simplified form of ( (8x+1)^2-(8x-1)^2 )?

Answer and explanation

Correct answer: (32x)

This expression has the form \((a+b)^2-(a-b)^2\), whose simplification is \(4ab\). Set \(a=8x\) and \(b=1\). Then \(4ab=4(8x)(1)=32x\), so option B is correct. The important point is that a represents the complete term \(8x\), not just the numerical coefficient 8. This is why the answer is linear in x rather than a constant or a squared expression.

Expanding gives the same confirmation: \((8x+1)^2=64x^2+16x+1\), while \((8x-1)^2=64x^2-16x+1\). On subtraction, the two \(64x^2\) terms cancel, as do the constant 1 terms. The remaining part is \(16x-(-16x)=32x\). Option A is only half of the correct difference; options C and D retain terms that should cancel. Hence the second choice follows exactly from the identity.

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Square Difference8X32X

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