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

Answer and explanation

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

For the linear combination, \((f+3g)(x)=f(x)+3g(x)\). Therefore, \(x^2-2x+3x=x^2+x\), so option A is correct. Option B results from subtracting \(3x\) instead of adding it. Exam tip: write the combination rule first, then substitute the functions.

Related tags

Relations-And-FunctionsAlgebra-Of-Real-FunctionsLinear-Combination-Of-FunctionsAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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