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The square of a number becomes 202 after adding 6. What is the positive value of the number?

Answer and explanation

Correct answer: 14

Let the number be x. The statement says x² + 6 = 202, because 6 is added to the square of the number. Subtracting 6 from both sides gives x² = 196. Since 196 = 14², the possible values of x are 14 and −14. The question specifically asks for the positive value, so x = 14 and option C is correct. Option A would give 144 + 6 = 150, option B would give 169 + 6 = 175, and option D would give 225 + 6 = 231; none of these equals 202. The governing idea is translating a verbal statement into a quadratic equation and then selecting the root that satisfies the stated sign condition.

Related tags

Quadratic EquationsWord ProblemsNumber ApplicationsWord Problems And ApplicationsMathematicsClass 10 Mcq

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