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If \(f(x)=x+2\) and \(g(x)=x-5\), what is the domain of \(\left(\frac{f}{g}\right)(x)\)?

Answer and explanation

Correct answer: \(\mathbb{R}\setminus\{5\}\)

The quotient is \(\left(\frac{f}{g}\right)(x)=\frac{x+2}{x-5}\), so its denominator must not be zero. Thus \(x-5\neq 0\), or \(x\neq 5\), giving the domain \(\mathbb{R}\setminus\{5\}\). In option B, \(-2\) is excluded even though it only makes the numerator zero, which is allowed. Exam tip: For a quotient, exclude only the values that make the denominator zero.

Related tags

Relations And FunctionsAlgebra Of Real FunctionsQuotient FunctionsDomain Of A FunctionMathematicsClass 11 Mcq

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