# Thread: function composition

1. ## function composition

i am utterly confused about this.

question says: find two functions f and g so that h(x)=2(x-9)^3-(x-9)^2+4

i dont know the first step id take to go about this problem, any help would be appreciated. this was a question on my test and i got it wrong, and it was a full 6pt deduction.

thanks!

2. ## Re: function composition

Originally Posted by noork85
i am utterly confused about this.

question says: find two functions f and g so that h(x)=2(x-9)^3-(x-9)^2+4

i dont know the first step id take to go about this problem, any help would be appreciated. this was a question on my test and i got it wrong, and it was a full 6pt deduction.

thanks!
you just need to notice one function "inside" another ...

$g(x) = x-9$

$f(x) = 2x^3 - x^2 + 4$

$h(x) = f[g(x)]$

3. ## Re: function composition

ahh...i see. i failed to notice that it says "composition"

thank u very much!