Composition of Functions: For each of the following find....?

i) F(g(x))
ii) G(f(x))
iii) the domain of G(F(x))

1) f(x) = 10/x and g(x) = (x)/(x+1)

2) f(x) = -4x^2 and g(x) = 8/x

I know how to plugg it in. but I need help on trying to get the result of the problem?.....
 
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