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What is the value of 1.5^2-0.5^2?

Answer and explanation

Correct answer: 2

The governing concept is the difference-of-squares identity, a^2-b^2=(a-b)(a+b). Apply it with a=1.5 and b=0.5: (1.5)^2-(0.5)^2=(1.5-0.5)(1.5+0.5). The first factor is 1 and the second factor is 2, so their product is 1×2=2. Therefore option B is correct. Direct checking gives 1.5^2=2.25 and 0.5^2=0.25, whose difference is also 2. Option A may result from calculating only the difference of the numbers; option C can come from adding incorrectly, and option D reflects an arithmetic error. The identity works equally well with decimal numbers, provided the signs and parentheses are handled carefully.

Related tags

PolynomialsDifference-Of-SquaresDecimal-ArithmeticOperations On Real Numbers And The Laws Of ExponentsMathematicsClass 10 Mcq

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