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

Answer and explanation

Correct answer: \(\frac{3x-2}{x^2+1}\)

By the definition of the sum of two functions, \((f+g)(x)=f(x)+g(x)\). Since the denominators are the same, add the numerators: \((2x+1)+(x-3)=3x-2\). Therefore, \((f+g)(x)=\frac{3x-2}{x^2+1}\). Option C results from incorrectly treating the constant terms; \(1+(-3)=-2\), not \(+4\). Exam tip: when adding algebraic fractions with the same denominator, add only the numerators and retain the common denominator; here \(x^2+1>0\), so the denominator is never zero.

Related tags

Relations-FunctionsAlgebra-Real-FunctionsSum-Of-FunctionsRational-FunctionsAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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