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If f(x) = 1/(x + 4) and g(x) = x^2, what is the domain of (f − g)(x)?

Answer and explanation

Correct answer: R − {−4}

The domain of a difference of functions is the intersection of the domains of the two functions. The polynomial g(x) = x^2 is defined for every real number. The rational function f(x) = 1/(x + 4) is undefined where its denominator equals zero. Solving x + 4 = 0 gives x = −4, so that single value must be excluded. For all other real numbers, both functions exist and their difference is defined. Therefore, the domain of (f − g)(x) is R − {−4}, which is option A. Option B excludes +4 instead of −4, option C ignores the denominator restriction, and option D includes only positive values greater than 4 without any mathematical reason. The operation of subtraction does not create a new restriction beyond the restrictions already present in the component functions.

Related tags

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

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