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If f(x)=x^2+4x+5 and g(x)=x+2, what is the domain of (f/g)(x)?

Answer and explanation

Correct answer: R\{-2}

The governing concept for a quotient function is that the denominator must be nonzero, while the numerator and denominator must otherwise be defined. Both given expressions are polynomials, so they are defined for all real x. The denominator is g(x)=x+2, and setting it equal to zero gives x=-2. This one value must be excluded, so the domain is R\{-2}. It is not necessary to exclude a zero of the numerator; a quotient can equal zero when its numerator is zero, provided the denominator is nonzero. Option B incorrectly includes the forbidden denominator value, option C removes the wrong number, and option D keeps only part of the valid domain. Therefore option A is correct.

Related tags

Relations-FunctionsQuotient-DomainPolynomial-FunctionsReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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