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A positive integer multiplied by its next integer gives 552. What is the number?

Answer and explanation

Correct answer: 23

Let the positive integer be \(x\). Its product with the next integer is \(x(x+1)=552\), so \(x^2+x-552=0\). Factoring gives \((x-23)(x+24)=0\), yielding \(x=23\) or \(x=-24\). Since the number is specified as positive, \(x=23\) is correct. Check: \(23\times24=552\). Exam tip: Represent the number and its next integer as \(x\) and \(x+1\) before forming the quadratic equation.

Related tags

Quadratic-EquationsWord-ProblemsPositive-IntegersNext-IntegerFactorisationWord Problems And ApplicationsQuadratic EquationsMathematics

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