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For real numbers x, what is the maximum value of the function \(f(x)=5-(x-2)^2\)?

Answer and explanation

Correct answer: 5

For every real number \(x\), \((x-2)^2\geq 0\), so \(5-(x-2)^2\leq 5\). When \(x=2\), the squared term is zero and \(f(2)=5\). Therefore, the maximum value is 5. The distractor 7 is incorrect because the non-negative square is being subtracted. Exam tip: A function of the form \(a-(x-h)^2\) has maximum value \(a\).

Related tags

Maximum ValueQuadratic FunctionRange Of FunctionReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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