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What is the maximum value of y = 1/(x² + 9)?

Answer and explanation

Correct answer: 1/9

For every real x, x^2 ≥ 0, so x^2 + 9 ≥ 9. The denominator is positive and has its smallest possible value, 9, when x = 0. For positive numbers, the reciprocal decreases as the denominator increases; therefore 1/(x^2 + 9) ≤ 1/9. Equality occurs at x = 0, giving y = 1/9, so option A is the maximum value. Option B confuses the denominator with its reciprocal. Option C is approached as |x| becomes very large but is never attained for a finite real x because the numerator is 1. Option D is impossible because x^2 + 9 is never equal to 1. Thus the inequality and equality condition establish the answer unambiguously.

Related tags

Rational-FunctionsMaximum-ValueInequalityDomain-RangeStandard-FunctionsGraphs Of Standard FunctionsRelations And FunctionsMathematics

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