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What is the maximum value of the function \(f(x)=-x^2+1\)?

Answer and explanation

Correct answer: 1

For every real \(x\), \(x^2\ge 0\), so \(-x^2\le 0\) and hence \(f(x)=-x^2+1\le 1\). At \(x=0\), \(f(0)=1\), so the maximum value is 1. Option C is incorrect because the function equals 0, not -1, when \(x=\pm1\). Exam tip: a quadratic \(ax^2+bx+c\) with \(a<0\) opens downward, so its vertex gives the maximum value.

Related tags

Standard-FunctionsQuadratic-FunctionsMaximum-ValueGraphs Of Standard FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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