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What is the value of (15^2-9^2)?

Answer and explanation

Correct answer: 144

Use the identity \(a^2-b^2=(a-b)(a+b)\). Thus, \(15^2-9^2=(15-9)(15+9)=6\times24=144\). Therefore, 144 is the correct answer. A value such as 154 can result from an error in subtraction or multiplication. Exam tip: For expressions involving a difference of squares, use the identity instead of calculating both squares separately.

Related tags

ExponentsNumber SystemsDifference Of SquaresAlgebraic IdentitiesArithmeticMathematicsClass 9 Mcq

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