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If f(x)=(x+1)/(x−3) and g(x)=x−3, what is the domain of (f/g)(x)?

Answer and explanation

Correct answer: ℝ\{3}

The governing concept is the domain of a quotient of functions. Both f(x) and g(x) must be defined, and the divisor g(x) must not equal zero. For f(x)=(x+1)/(x−3), the denominator is zero at x=3, so f is undefined there. Also, g(3)=3−3=0, so the quotient is independently forbidden at the same value. Hence every real number except 3 belongs to the domain. The numerator x+1 may be zero at x=−1; a zero numerator is allowed and does not remove −1 from the domain. Therefore the domain is ℝ\{3}, making option A correct. Option B incorrectly includes x=3. Option C unnecessarily excludes −1, and option D excludes the wrong point. Even if the quotient is written in a different algebraic form, the original restrictions must be preserved.

Related tags

Relations-And-FunctionsDomainQuotient-Of-FunctionsReal-Valued-FunctionsAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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