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What is the axis of symmetry of the graph of the function \(f(x)=x^2-10x+21\)?

Answer and explanation

Correct answer: \(x=5\)

For a quadratic function \(f(x)=ax^2+bx+c\), the axis of symmetry is \(x=-\frac{b}{2a}\). Here, \(a=1\) and \(b=-10\), so \(x=-\frac{-10}{2(1)}=5\). Therefore, the correct axis is \(x=5\). The option \(x=-5\) results from a sign error, while \(y=5\) is not the correct form of the axis for this graph. Exam tip: Identify the coefficients of \(x^2\) and \(x\), then apply \(-\frac{b}{2a}\) directly.

Related tags

Standard-FunctionsQuadratic-GraphAxis-Of-SymmetryParabolaGraphs Of Standard FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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