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The sum of the squares of two consecutive natural numbers is 365. Which two numbers are they?

Answer and explanation

Correct answer: 13 and 14

Let the consecutive numbers be \(x\) and \(x+1\). Then \(x^2+(x+1)^2=365\), which gives \(2x^2+2x-364=0\) or \(x^2+x-182=0\). Factoring, \((x-13)(x+14)=0\), so \(x=13\) or \(x=-14\). Since the numbers are natural, \(x=13\), giving 13 and 14. Check: \(13^2+14^2=169+196=365\). Exam tip: Represent consecutive numbers as \(x\) and \(x+1\) before forming the quadratic equation.

Related tags

Quadratic EquationsWord ProblemsConsecutive Natural NumbersSum Of SquaresFactorisationWord Problems And ApplicationsMathematicsClass 10 Mcq

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