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The sum of the squares of two consecutive positive odd numbers is 650. What is the smaller number?

Answer and explanation

Correct answer: 17

Let the smaller number be \(x\). Consecutive odd numbers differ by 2, so the numbers are \(x\) and \(x+2\). Thus, \(x^2+(x+2)^2=650\), which gives \(x^2+2x-323=0\). Factoring gives \((x-17)(x+19)=0\), so \(x=17\) or \(x=-19\). Since the numbers are positive, \(x=17\) is valid. The nearby distractor 19 would give the pair 19 and 21, whose squared sum is 802, not 650. Exam tip: Always verify the selected number with the next odd number in the original condition.

Related tags

Quadratic EquationsWord ProblemsOdd IntegersSum Of SquaresConsecutive NumbersWord Problems And ApplicationsMathematicsClass 10 Mcq

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