# Thread: Express f(g) as a function of x

1. ## Express f(g) as a function of x

Hi,

I'm working from "The Chemistry Maths Book" 2nd ed. by Erich Steiner. I have no idea what I'm mean to do in this question:

If f(x)=2x-1 and g(x)=3x+1, express f(g) as a function of x.

Any help is greatly appreciated

2. Originally Posted by blackdragon190
Hi,

I'm working from "The Chemistry Maths Book" 2nd ed. by Erich Steiner. I have no idea what I'm mean to do in this question:

If f(x)=2x-1 and g(x)=3x+1, express f(g) as a function of x.

Any help is greatly appreciated
f(g) = 2g -1. Now substitute g = 3x + 1.

3. I got it, thanks for your help!