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The product of a positive number and the number 4 greater than it is 221. What is the smaller number?

Answer and explanation

Correct answer: 13

Let the smaller positive number be \(x\). The other number is \(x+4\), so \(x(x+4)=221\), giving \(x^2+4x-221=0\). Factoring, \((x-13)(x+17)=0\), so the solutions are \(13\) and \(-17\). Since the number is specified as positive, \(x=13\) is valid. Therefore, the smaller number is 13. Exam tip: In such word problems, represent the smaller number by \(x\) and express the other number directly from the given difference.

Related tags

Quadratic EquationsWord ProblemsNumber ApplicationsAlgebraic EquationsWord Problems And ApplicationsMathematicsClass 10 Mcq

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