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

Answer and explanation

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

The direct answer is option A: \(x-1\), with \(x\ne-1\). Compute the difference: \((f-g)(x)=\frac{x^2}{x+1}-\frac{1}{x+1}=\frac{x^2-1}{x+1}\). Factor the numerator: \(x^2-1=(x-1)(x+1)\). Cancelling gives \(x-1\), but the original denominator still shows that \(x=-1\) is forbidden. Option A is correct. Option B, \(x+1\), comes from incorrect cancellation or factoring. Option C is not fully simplified and also gives the wrong excluded value \(x\ne1\); the original denominator excludes \(-1\). Option D fails because it does not cancel the common factor and is not equal to the difference. Always retain restrictions from the original expressions.

Related tags

Relations-FunctionsAlgebra-Real-FunctionsDifference-FunctionsSimplification

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