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If f(x) = 1/(x − 3) and g(x) = x^2, what is the domain of (f + g)(x)?

Answer and explanation

Correct answer: R − {3}

The domain of a sum of functions is the intersection of the domains of the individual functions. The polynomial g(x) = x^2 is defined for every real number. The rational function f(x) = 1/(x − 3), however, is undefined when its denominator is zero. Solving x − 3 = 0 gives x = 3, so 3 must be excluded. For every other real x, both f and g are defined and their sum exists. Consequently, the domain of (f + g)(x) is R − {3}, making option A correct. Option B overlooks the denominator restriction, option C excludes the wrong number, and option D lists only the forbidden value instead of all allowed real values.

Related tags

DomainAlgebra-Of-FunctionsRational-FunctionAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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