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The difference between two positive numbers is 6, and their product is 216. What is the smaller number?

Answer and explanation

Correct answer: 12

Let the smaller number be \(x\); then the larger number is \(x+6\). Thus, \(x(x+6)=216\), or \(x^2+6x-216=0\). Factoring gives \((x-12)(x+18)=0\), so \(x=12\) or \(x=-18\). Since the numbers are positive, the smaller number is 12. Check: \(12\times18=216\) and \(18-12=6\). Exam tip: In such problems, let the smaller number be \(x\) and express the other number using the given difference.

Related tags

Quadratic EquationsWord ProblemsPositive IntegersNumber ProblemsWord Problems And ApplicationsMathematicsClass 10 Mcq

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