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If f(x) = (x + 1)/(x − 1) and g(x) = (x − 1)/(x + 1), what is (f + g)(0)?

Answer and explanation

Correct answer: −2

The governing concept is addition of functions together with a domain check. By definition, (f+g)(x)=f(x)+g(x), provided both functions are defined at x. At x=0, f(0)=(0+1)/(0−1)=1/(−1)=−1, while g(0)=(0−1)/(0+1)=(−1)/1=−1. Hence (f+g)(0)=−1+(−1)=−2, so option A is correct. The value is defined because f excludes x=1, g excludes x=−1, and x=0 is allowed for both. Option B would incorrectly cancel or combine terms, option C ignores the negative signs, and option D incorrectly treats zero as a forbidden denominator value.

Related tags

Function-AdditionRational-FunctionsDomain-CheckSubstitutionAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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