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If f(x) = x + 3 and g(x) = 2x, what is (f + g)(2)?

Answer and explanation

Correct answer: 9

The governing concept is addition of functions, defined pointwise by (f + g)(x) = f(x) + g(x). Evaluate each function at x = 2: f(2) = 2 + 3 = 5 and g(2) = 2(2) = 4. Add the results: (f + g)(2) = f(2) + g(2) = 5 + 4 = 9. Hence option A is correct. Option B is f(2) plus an incorrect value, option C may result from using only 2 + 2, and option D is only f(2), omitting g(2). It is important not to confuse function addition with composition; the notation f + g means adding corresponding outputs, not placing one function inside the other.

Related tags

Sum Of FunctionsFunction OperationEvaluationFunctionsRelations And FunctionsMathematicsClass 12 Mcq

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