Homework Help: math

Posted by Jeromino on Thursday, March 31, 2011 at 5:02am.

If f(x)=x and g(x)=x+1 find the function and its domain:

1. gof

2. fof

math - Jai, Thursday, March 31, 2011 at 5:29am
(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, Thursday, March 31, 2011 at 5:38am
Sweet! Thanks

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