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What is the correct value of ( 1004^2-996^2 )?

Answer and explanation

Correct answer: (16000)

The direct answer is B, 16000. Use the difference-of-squares identity: \\(a^2-b^2=(a+b)(a-b)\\). Here, take a=1004 and b=996. Their sum is 1004+996=2000, and their difference is 1004-996=8. Therefore, \\(1004^2-996^2=2000\\times8=16000\\). Option A, 8000, is too small and can result from using only part of the calculation. Option B is correct because it uses both the sum and the difference. Option C, 2000, is only the sum, not the required product. Option D, 4000, does not follow from the identity and may come from an incorrect operation involving the difference. This identity is useful because it avoids calculating two large squares separately. Memory cue: square difference means sum multiplied by difference.

Related tags

Difference Of SquaresNumerical Identity1004 996

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