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For real numbers x, find the range of the function \(f(x)=\frac{1}{x^2+4}\).

Answer and explanation

Correct answer: \((0,\frac{1}{4}]\)

For every real x, \(x^2\ge 0\), so \(x^2+4\ge 4\). Hence \(0<\frac{1}{x^2+4}\le\frac14\). The maximum value \(\frac14\) occurs at \(x=0\), while 0 is never attained; therefore, the range is \((0,\frac14]\). Exam tip: for a positive denominator, the reciprocal is largest when the denominator is smallest.

Related tags

Relations And FunctionsReal Valued FunctionsRangeDomain And RangeQuadratic ExpressionTheir Domain And RangeReal Valued Functions Their Domain And RangeMathematics

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