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If \(f(x)=3x-2\) and \((f+g)(x)=x^2+x\), what is the expression for \(g(x)\)?

Answer and explanation

Correct answer: \(x^2-2x+2\)

Subtract the known function from the sum: \(g(x)=(f+g)(x)-f(x)=(x^2+x)-(3x-2)=x^2-2x+2\). Hence, option A is correct. Option D results from failing to subtract the \(3x\) term correctly. Exam tip: For the sum of functions, subtract the known function term by term to obtain the unknown function.

Related tags

Relations-FunctionsAlgebra-Of-FunctionsFunction-AdditionUnknown-FunctionAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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