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What is the value of ( 73^2-27^2 )?

Answer and explanation

Correct answer: (4600)

This expression is a difference of two squares. The identity is \\(a^2-b^2=(a+b)(a-b)\\). It is useful because it changes the subtraction of two large squares into two simpler factors. Here, take \(a=73\) and \(b=27\). Then \(a+b=100\) and \(a-b=46\). Their product is \(100\times46=4600\), so the value is 4600 and option A is correct.

The same result can be checked directly: \(73^2=5329\) and \(27^2=729\), and \(5329-729=4600\). However, the identity is faster and reduces the chance of making a large multiplication error. The other numerical choices do not equal the product of the sum and difference. Therefore option A follows from the difference-of-squares identity.

Related tags

Numeric IdentityDifference Of SquaresShortcut

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