Question

HELPP PLEASE!! DON'T KNOW WHAT TO DO!!
given f(x)=x^2+3 and g(x)=x+5/x. find (g o f)(4)

Answer 1

I think you doing it backwards, it should be

(x^2+3) + 5
-----------
x^2 + 3

Answer 2

im confused..

Answer 3

(g o f) = g(f(x))

Answer 4

now you insert the 4 as follows:

(4^2 + 3) + 5
-------------
4^2 + 3

Answer 5

woops sorry I did f(g(x))
\[f(x) = x^2+3\\g(x) = \frac{x+5}{x}\\g(f(x)) = \frac{(x^2+3)+5}{x^2+3}\\g(f(4)) = \frac{(4^2+3)+5}{4^2+3}\]

Answer 6

oooh i get it now! :) thanks guys

Answer 7

\[f(x) = x^2+3\\g(x) =\frac{x+5}{x}\\g(f(x)) = \frac{f(x)+5}{f(x)}=\frac{(x^2+3)+5}{x^2+3}\]

Answer 8

Think of the human centipede....