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If \(f(x)=\frac{x+2}{x-3}\) and \(g(x)=x-3\), what is the value of \((fg)(4)\)?

Answer and explanation

Correct answer: 6

The product of two real-valued functions is defined by \((fg)(x)=f(x)g(x)\). Thus, \((fg)(x)=\frac{x+2}{x-3}(x-3)=x+2\), with the restriction \(x\neq 3\). Therefore, \((fg)(4)=4+2=6\). Option 1 is only the value of \(g(4)\), while option 4 incorrectly treats \(x=4\) as outside the domain. Exam tip: write \((fg)(x)=f(x)g(x)\) first and check the original domain restriction before cancelling factors.

Related tags

Relations And FunctionsAlgebra Of FunctionsProduct Of FunctionsRational FunctionsDomainAlgebra Of Real FunctionsMathematicsClass 11 Mcq

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