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The sum of a number and its square is 72. What is the positive number?

Answer and explanation

Correct answer: 8

Let the number be \(x\). Then \(x+x^2=72\), so \(x^2+x-72=0\). Factoring gives \((x-8)(x+9)=0\), hence \(x=8\) or \(x=-9\). The positive number is therefore 8. In such questions, find both roots and then apply the stated positive or negative condition.

Related tags

Quadratic-EquationsWord-ProblemsPositive-RootsFactorisationNumber-And-SquareWord Problems And ApplicationsQuadratic EquationsMathematics

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