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If f(x) = x² − 5x + 6 and g(x) = x − 3, what are the simplified form and domain of f/g?

Answer and explanation

Correct answer: x − 2, x ≠ 3

For a quotient of functions, simplify the algebraic expression but preserve every restriction imposed by the original denominator. Factor the numerator: x²-5x+6=(x-2)(x-3). Since g(x)=x-3, we have (f/g)(x)=[(x-2)(x-3)]/(x-3)=x-2, provided x-3≠0. Thus x=3 is excluded from the domain, even though the factor cancels in the simplified expression; the original quotient is undefined there and has a removable hole. Therefore option A is correct. Option B incorrectly includes x=3, option C uses the wrong factor and restriction, and option D leaves the numerator unsimplified.

Related tags

Relations-FunctionsQuotient-Of-FunctionsDomainFactorisationAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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