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The product of the numbers 5 less and 14 more than a positive number is 1242. What is the original number?

Answer and explanation

Correct answer: 32

Let the positive number be \(x\). Then \((x-5)(x+14)=1242\). Substituting \(x=32\), we get \((32-5)(32+14)=27\times46=1242\), so the original number is 32. Exam tip: In such word problems, testing the options in the equation can be a quick alternative to solving the quadratic equation completely.

Related tags

Quadratic EquationsWord ProblemsNumber ProblemsSubstitutionAlgebraic EquationsWord Problems And ApplicationsMathematicsClass 10 Mcq

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