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If \(f(x)=3x^2\) and \(x\in\mathbb{R}\), what is its range?

Answer and explanation

Correct answer: \([0,\infty)\)

For every real \(x\), \(x^2\ge 0\), so \(f(x)=3x^2\ge 0\). Also, when \(x=0\), \(f(0)=0\), so zero is included in the range. Therefore, the range is \([0,\infty)\). Option A is incorrect because it excludes zero, while option C includes negative values that the function cannot produce. Exam tip: For a squared function, first identify its minimum value.

Related tags

RangeQuadratic FunctionsReal Valued FunctionsRelations And FunctionsClass 11Their Domain And RangeReal Valued Functions Their Domain And RangeMathematics

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