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For f(x) = 1/(x² + 6), when is the greatest value obtained?

Answer and explanation

Correct answer: When x = 0

The governing idea is that a positive fraction with fixed numerator becomes largest when its positive denominator is smallest. For every real x, x² ≥ 0, so x² + 6 ≥ 6. The smallest denominator, 6, occurs exactly when x² = 0, that is, when x = 0. Consequently f(0) = 1/6, which is the maximum value. At x = 1 the value is 1/7, and at x = 6 it is 1/42, both smaller than 1/6. The maximum is actually attained because x = 0 belongs to the real domain. Therefore option A is correct. Option D is false, while options B and C identify inputs that produce smaller values rather than the greatest one.

Related tags

Maximum ValueRational FunctionsReal-Valued FunctionsReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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