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What is the value of \(2.5^2-1.5^2\)?

Answer and explanation

Correct answer: 4

The governing algebraic concept is the difference-of-squares identity, \(a^2-b^2=(a-b)(a+b)\). Taking \(a=2.5\) and \(b=1.5\), the expression becomes \((2.5-1.5)(2.5+1.5)\). The first factor is \(1\), and the second factor is \(4\), so their product is \(1\times4=4\). Direct checking gives \(2.5^2=6.25\) and \(1.5^2=2.25\), whose difference is also \(6.25-2.25=4\). Thus option C is correct. Options A, B and D can result from an arithmetic error or from applying the identity incorrectly; the decimal values do not change the validity of the identity.

Related tags

Difference-Of-SquaresReal-NumbersAlgebraic-IdentitiesOperations On Real Numbers And The Laws Of ExponentsPolynomialsMathematicsClass 10 Mcq

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