Posted by **Kennedy** on Monday, December 15, 2008 at 3:36pm.

f(x)=1/x, g(x)=3X+1 find:

f(g(3)) how do i do thiss...

f(g(-2))

g.g, g.f, f.g, pleaseee help:)thanks for your timeee

- Math -
**Reiny**, Monday, December 15, 2008 at 4:28pm
you can first find g(3) = 10

then do f(1) = 1/10

so g(g(3)) = 1/10

you try the other one.

another way is to find f(g(x)) itself.

this would be practical if you had a whole bunch of question to find

f(g(x))

= 1/(3x+1)

notice the right side gives you 1/10 directly

- Math -
**Reiny**, Monday, December 15, 2008 at 4:31pm
my third line should have said

f(g(3)) = 1/10

for your last part,

e.g. gºg would mean g(g(x))

= 3(3x+1) + 1

= 9x+ 4

- Math -
**Kennedy**, Monday, December 15, 2008 at 4:41pm
OHHH thanks reiniyyyy

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