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If \(f(x)=x^2\) and \(f(a)=16\), what is the positive value of \(a\)?

Answer and explanation

Correct answer: 4

Since \(f(a)=a^2\), we have \(a^2=16\), giving \(a=\pm4\). The question asks for the positive value, so \(a=4\) is correct. The value 16 is \(f(a)\), not \(a\). Exam tip: when taking a square root, consider both signs and then apply any stated sign condition.

Related tags

FunctionsEvaluationSquare RootsRelations And FunctionsReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeMathematicsClass 11 Mcq

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