Posted by **mary** on Monday, October 25, 2010 at 1:18pm.

Given two functions as:

f(x) = x2-x-1 and g(x) = 3/x

Find fog(x) also find the domain of f, g and fog

- calculus -
**Reiny**, Monday, October 25, 2010 at 3:09pm
domain of f : any real number

domain of g : any real number except x ≠ 0

fog

= f(g(x))

= f(3/x)

- (3/x)^2 - 3/x - 1

clearly the domain of fog is any real number, except x≠0

- calculus -
**Reiny**, Monday, October 25, 2010 at 3:10pm
last line in calculation should say

= (3/x)^2 - 3/x - 1

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