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

Answer and explanation

Correct answer: (1-x)

The direct answer is A: \(1-x\), for \(x\ne1\). Start with \(\left(\frac{f}{g}\right)(x)=\frac{x^2-2x+1}{1-x}\). The numerator is \((x-1)^2\). The denominator is \(1-x=-(x-1)\). Hence the quotient is \(\frac{(x-1)^2}{-(x-1)}=-(x-1)=1-x\), provided \(x\ne1\). Option A is correct. Option B gives \(x-1\), which has the opposite sign; it forgets that \(1-x=-(x-1)\). Option C, \(x+1\), does not follow from either factorisation. Option D, \(x^2-1"), is not the result after cancellation and has unrelated factors. At \(x=1\), the original denominator is zero, so that value is excluded even though the simplified expression can be evaluated there. Sign check: reverse the order in a subtraction and a minus sign appears.

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