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If (f(x)=x^2+1) and (g(x)=2x) then what is the value of ((f\circ g)(1)+(g\circ f)(1))?

Answer and explanation

Correct answer: (9)

The direct answer is option A, 9. A composition means applying the function on the right first. Thus \\(f\\circ g)(1)=f(g(1))\\). First, \\(g(1)=2\\). Then \\(f(2)=2^2+1=5\\). In the other order, \\(g\\circ f)(1)=g(f(1))\\). Now \\(f(1)=1^2+1=2\\), so \\(g(2)=2(2)=4\\). Therefore the required sum is \\(5+4=9\\). Option A works because it gives this complete calculation. Option B, 7, is not the sum of the two correct composition values. Option C, 6, is also incorrect and may result from adding or evaluating only partly. Option D, 5, is just one of the two values, not their total. Remember: in \\(f\\circ g\\), do g first, then f.

Related tags

Relations-FunctionsAlgebra-Real-FunctionsComposition-Value

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