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If \(f(x)=x^2-3x+2\) and \(g(x)=x-1\), what is the correct form of \(\left(\frac{f}{g}\right)(x)\)?

Answer and explanation

Correct answer: (x-2,\ x\ne 1)

The direct answer is option A: \(x-2\), with \(x\ne1\). Function division means \(\left(\frac fg\right)(x)=\frac{f(x)}{g(x)}\). Factor the numerator: \(x^2-3x+2=(x-1)(x-2)\). Hence \(\frac{(x-1)(x-2)}{x-1}=x-2\), but only where the original denominator is nonzero. Since \(g(x)=x-1\), we must exclude \(x=1\), even though cancellation simplifies the expression. Option A includes both the correct rule and restriction. Option B wrongly allows x=1. Option C has the wrong factor and sign. Option D gives the wrong simplified expression and wrongly excludes 2 instead of 1. Important lesson: simplifying a quotient does not restore a value where the original denominator was zero.

Related tags

Relations-FunctionsQuotient-SimplificationDomain

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