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At which \(x\)-value does the graph of the function \(f(x)=\sqrt{x-4}\) begin?

Answer and explanation

Correct answer: \(x=4\)

For real-valued outputs, the expression inside the square root must be non-negative: \(x-4\ge 0\), so \(x\ge 4\). At \(x=4\), \(f(4)=0\), giving the starting point \((4,0)\). Therefore, the graph begins at \(x=4\), not at any smaller value. Exam tip: the graph of \(\sqrt{x-a}\) starts at \(x=a\).

Related tags

Relations-FunctionsStandard-GraphsSquare-Root-FunctionDomainGraphs Of Standard FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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