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What is the value of \(15^2 - 11^2\)?

Answer and explanation

Correct answer: 104

Use the difference of squares identity: \(a^2-b^2=(a-b)(a+b)\). Here \(15^2-11^2=(15-11)(15+11)=4\times26=104\). The closest distractor 94 is wrong — it would correspond to a subtraction or squaring error (for example misreading 121 as 131). Correct application of the identity gives 104. Exam tip: convert \(a^2-b^2\) to \((a-b)(a+b)\) to simplify mental calculation and avoid large subtractions.

Related tags

ExponentsDifference Of SquaresAlgebraMental ArithmeticNumber SystemsMathematicsClass 9 Mcq

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