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If \(f(x)=\frac{x+2}{x-1}\), what is the value of \(f(4)\)?

Answer and explanation

Correct answer: 2

Substituting \(x=4\) in the given function gives \(f(4)=\frac{4+2}{4-1}=\frac{6}{3}=2\). Therefore, option A is correct. The denominator is \(x-1\), so the domain excludes \(x=1\); \(x=4\) is valid. Exam tip: in a rational function, first check that the denominator is non-zero, then substitute the given value.

Related tags

Real-Valued-FunctionsFunction-ValueRational-FunctionsDomain-And-RangeReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematics

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