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The product of the numbers obtained by subtracting 5 from and adding 5 to a number is 119. What is the positive number?

Answer and explanation

Correct answer: 12

Let the number be \(x\). Then \((x-5)(x+5)=119\). Using the difference of squares, \(x^2-25=119\), so \(x^2=144\) and \(x=\pm 12\). Since the question asks for the positive number, the answer is \(12\). Exam tip: For expressions of the form \((x-a)(x+a)\), apply \(x^2-a^2\) directly.

Related tags

Quadratic EquationsWord ProblemsDifference Of SquaresPositive IntegersWord Problems And ApplicationsMathematicsClass 10 Mcq

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