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If \(f(x)=x^2+4x\) and \(g(x)=2x^2-x\), what is \((f+g)(x)\)?

Answer and explanation

Correct answer: \(3x^2+3x\)

The sum of two functions is obtained by adding their values at the same input: \((f+g)(x)=f(x)+g(x)\). Thus, \((x^2+4x)+(2x^2-x)=3x^2+3x\). The quadratic terms and linear terms are combined separately. Exam tip: while adding algebraic functions, combine only like terms.

Related tags

Relations-FunctionsAlgebra-Real-FunctionsFunction-AdditionLike-TermsAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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