1. (f o g)(x) 2. the domain of (f o g)‚Äč

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For f(x)=4/x+4 and g(x)=7/x 


1. (f o g)(x)

2. the domain of (f o g)

Jun 7th, 2015

Thank you for the opportunity to help you with your question!

f(x) = 4/x + 4

g(x) = 7/x

To take the composition of f and g (fog), replace the x in f(x) with g(x):

(fog)(x) = 4/xg+ 4  [f(x) = 4/x + 4]

(fog)(x) = 4/x(7/x) + 4          [since g(x) = 7/x]

(fog)(x) = 28/x^2+4


As it is simple a linear equation. so, domain will be defibned for all real values R.

Hope this will help you!

Please let me know if you need any clarification. I'm always happy to answer your questions.
Jun 7th, 2015

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