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What is the value of ( 1008^2-992^2 )?

Answer and explanation

Correct answer: (32000)

The direct answer is option B: 32000. Use the difference-of-squares identity \(a^2-b^2=(a+b)(a-b)\), rather than calculating two large squares. Here \(a=1008\) and \(b=992\). Thus \(1008^2-992^2=(1008+992)(1008-992)=2000\times16=32000\). Option A, 16000, misses a factor of 2. Option B follows both factors correctly. Option C, 20000, is only the sum factor and does not include the difference factor. Option D, 8000, is also not the product of 2000 and 16. A useful check is that the numbers are close, so their square difference equals their sum times the small difference. Memory cue: difference of squares means add the numbers, subtract the numbers, then multiply.

Related tags

Numerical IdentityDifference Of SquaresLarge Numbers

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