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If \(f(x)=x^2-4x+4\) and \(g(x)=x-2\), what is \(\left(\frac{f}{g}\right)(x)\) for \(x\ne 2\)?

Answer and explanation

Correct answer: \(x-2\)

\(\left(\frac{f}{g}\right)(x)=\frac{f(x)}{g(x)}=\frac{x^2-4x+4}{x-2}\). Factoring the numerator as \((x-2)^2\) gives \(\frac{(x-2)^2}{x-2}=x-2\), provided \(x\ne2\). Hence, option A is correct. Option C would be obtained only if the numerator and denominator were identical, which they are not before simplification. Exam tip: factor the numerator first and retain any value excluded by the original denominator.

Related tags

AlgebraReal FunctionsQuotient Of FunctionsFactorisationAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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