Talk:Function composition/Archive

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Hi, I'm trying to figure this out, I am not sure about my answer.

Given Funtions f(x) = Square root of x and g(x) = x2 + 18x + 81

a, Determine(fog)(x) and simplify

(fog)(x) = Square root of x^2 +18x +81

        = square root of (x+9)^2
        = x+9

b, Find the Domain of (fog)(x)

   ???????

Is answer to a correct and if so how do i find its domain ??