# Math Help - Express the function...

1. ## Express the function...

Express the function in the form f g. (Use only elementary functions, but not the identity function, g(x) = x.)

I am totally lost on what to do.

When it gives mt F(x) and tells me to find g(x) I can do fine... but this.... this is weird.

AND this one confounds me as well
Express the function in the form f g. (Use only elementary functions, but not the identity function, g(x) = x.)

2. Originally Posted by leftyguitarjoe
Express the function in the form f g. (Use only elementary functions, but not the identity function, g(x) = x.)

I am totally lost on what to do.

Then it gives mt F(x) and tells me to find g(x) I can do fine... but this.... this is weird.
my first question may seem silly to you, but consider it seriously: do you understand what $f \circ g$ means.

i do not like problems like this, because you usually have several answers that are correct. but i bet this is the answer they are looking for:

$f(x) = \sqrt[3]{x}$ and $g(x) = \frac x{4 + x}$

now see if you can tell why that answer makes sense, after considering the question i asked you earlier

AND this one confounds me as well
Express the function in the form f compose g. (Use only elementary functions, but not the identity function, g(x) = x.)
if you think you got it, try this one yourself and tell us your answer

3. Yes, I am familiar with f(g)) and such.

Thanks for the help. I'll go work out the other one and report back.

4. ok, so the other one should be:

f(x) =

and

g(x) =

EDIT
err I mean to make those "t"'s not "x"'s

but ya catch my drift.

5. Originally Posted by leftyguitarjoe
ok, so the other one should be:

f(x) =

and

g(x) =
yup

6. gah.

I think too hard. thats my problem haha.

7. Originally Posted by leftyguitarjoe
gah.

I think too hard. thats my problem haha.
that's a lot of people's problem

good luck