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If \(f(x)=2x+5\) and \(g(x)=5-2x\), what is the value of \((f+g)(x)\)?

Answer and explanation

Correct answer: \(10\)

By the definition of the sum of two functions, \((f+g)(x)=f(x)+g(x)\). Thus, \((f+g)(x)=(2x+5)+(5-2x)=10\), since \(2x\) and \(-2x\) cancel each other. Option B does not correctly add the corresponding terms, while option C is related to subtraction. In an exam, add the values of the two functions for the same input.

Related tags

Relations And FunctionsAlgebra Of FunctionsFunction AdditionReal FunctionsAlgebra Of Real FunctionsMathematicsClass 11 Mcq

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