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What is the value of ( 51^2-49^2 )?

Answer and explanation

Correct answer: 200

Use the identity \(a^2-b^2=(a+b)(a-b)\). Here, \(51^2-49^2=(51+49)(51-49)=100\times2=200\). Option 100 is only the sum of the two numbers, while 2 is their difference; their product gives the required value. Exam tip: for the difference of squares of nearby numbers, apply this identity directly.

Related tags

Algebraic IdentitiesDifference Of SquaresMathematics Class 9Mental CalculationNumerical ExpressionsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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