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The square of a number is 24 more than 10 times the number. What is the positive number?

Answer and explanation

Correct answer: 12

Let the number be \(x\). Then \(x^2=10x+24\), so \(x^2-10x-24=0\). Factoring gives \((x-12)(x+2)=0\), hence \(x=12\) or \(x=-2\). Since the question asks for the positive number, the correct answer is 12. Exam tip: Find both roots of a quadratic equation and then apply any condition given in the question, such as positivity.

Related tags

Quadratic-EquationsWord-ProblemsRoots-Of-EquationsPositive-IntegerWord Problems And ApplicationsQuadratic EquationsMathematicsClass 10 Mcq

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