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

Answer and explanation

Correct answer: 7

The sum of two functions is defined by \((f+g)(x)=f(x)+g(x)\). Thus, \(f(5)=5+2=7\) and \(g(5)=5-5=0\), so \((f+g)(5)=7+0=7\). The value 12 results from an incorrect evaluation of the two functions. Exam tip: evaluate each function at the given input first, then add the results.

Related tags

AlgebraReal FunctionsFunction AdditionFunction ValueAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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