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If \(f(x)=0\) and \(g(x)=x+7\), what is the value of \((f+g)(x)\)?

Answer and explanation

Correct answer: \(x+7\)

The sum of two functions is defined by \((f+g)(x)=f(x)+g(x)\). Thus, \((f+g)(x)=0+(x+7)=x+7\). Adding the zero function leaves the other function unchanged, so option B is incorrect because \(g(x)\) is not the zero function. Exam tip: For a sum of functions, add their values at the same input \(x\).

Related tags

Relations And FunctionsAlgebra Of Real FunctionsFunction AdditionZero FunctionMathematicsClass 11 Mcq

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