math
posted by
Jeromino on
.
If f(x)=x and g(x)=x+1 find the function and its domain:
1. gof
2. fof

math 
Jai,
(gof)(x) means you substitute the whole expression of f(x) to g(x):
(gof)(x) = g(f(x)) = f(x) + 1
(gof)(x) = x + 1
for #2, we do the same,, we substitute f(x) to f(x):
(fof)(x) = f(x)
(fof)(x) = x
hope this helps~ :)

math 
Jeromino,
Sweet! Thanks