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For the function \(f(x)=\operatorname{sgn}(x-2)\), what is its value at \(x=5\)?

Answer and explanation

Correct answer: 1

Substituting \(x=5\) gives \(x-2=5-2=3>0\). The signum function has value \(1\) for a positive number, so \(f(5)=1\). The value \(0\) would occur only at \(x=2\), while \(-1\) occurs when \(x<2\). Exam tip: first determine the sign of the expression inside the signum function.

Related tags

Relations And FunctionsStandard FunctionsSignum FunctionFunction EvaluationReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeMathematicsClass 11 Mcq

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