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The product of the numbers that are 5 less than and 8 more than a number is 464. What is the positive original number?

Answer and explanation

Correct answer: 21

Let the original number be \(x\). Then \((x-5)(x+8)=464\), which simplifies to \(x^2+3x-504=0\), or \((x-21)(x+24)=0\). Thus, \(x=21\) or \(x=-24\); the positive original number is 21. In such problems, carefully translate ‘5 less’ as \(x-5\) and ‘8 more’ as \(x+8\).

Related tags

Quadratic EquationsWord ProblemsNumber ProductFactorisationPositive RootWord Problems And ApplicationsMathematicsClass 10 Mcq

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