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If f(x) = x² and g(x) = x + 1, what is (f ∘ g)(2)?

Answer and explanation

Correct answer: 9

The governing concept is composition of functions: (f ∘ g)(x) means that g is applied first and f is applied to the result. Therefore, (f ∘ g)(2) = f(g(2)). First calculate g(2) = 2 + 1 = 3. Next apply f to this output: f(3) = 3² = 9. Hence the required value is 9, so option A is correct. Option B, 5, could result from adding the two function values incorrectly; option C is only 2² and ignores g; option D does not follow the composition rule. The order of composition is essential because f ∘ g generally differs from g ∘ f.

Related tags

Composition Of FunctionsFunction EvaluationFunctionsRelations And FunctionsMathematicsClass 12 Mcq

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