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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: 0

By the definition of the sum of two functions, (f+g)(x)=f(x)+g(x)=(2x−5)+(5−2x)=0. Therefore, the result is the zero function, whose value is 0 for every x. Option B equals 2f(x), not f(x)+g(x). Exam tip: combine the variable terms and constant terms separately when adding functions.

Related tags

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

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