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If f(x) = x^2 − 9 and g(x) = x + 3, what is the simplified form of (f/g)(x), where x ≠ −3?

Answer and explanation

Correct answer: x − 3

The quotient function is defined by (f/g)(x) = f(x)/g(x), provided g(x) is not zero. Substituting the given expressions gives (x^2 − 9)/(x + 3). Factor the numerator as a difference of squares: x^2 − 9 = (x − 3)(x + 3). Therefore, for x ≠ −3, (f/g)(x) = [(x − 3)(x + 3)]/(x + 3) = x − 3. Option A is correct. The restriction x ≠ −3 must remain because the original denominator is zero there, even though the common factor cancels algebraically. Option B is the uncancelled denominator, option C uses an incorrect sign in the factorization, and option D does not follow from division.

Related tags

Quotient-Of-FunctionsFactorisationDomain-RestrictionAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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