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What is the value of ( 1005^2-995^2 )?

Answer and explanation

Correct answer: (20000)

The direct answer is option B, 20000. Use the difference-of-squares identity \(a^2-b^2=(a+b)(a-b)\), with \(a=1005\) and \(b=995\). First find the sum: \(1005+995=2000\). Then find the difference: \(1005-995=10\). Multiply: \(2000\times10=20000\). Option A, 10000, is not the product of the required sum and difference. Option B, 20000, follows exactly from the identity and is correct. Option C, 5000, does not use the correct sum and difference calculation. Option D, 2000, is only the sum of the two numbers, not the final value. This method avoids calculating two large squares separately. Memory cue: square difference means add the numbers, subtract the numbers, then multiply.

Related tags

Difference Of SquaresNumerical IdentityLarge Numbers

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