Combinations and Compositions of Functions: confused with Q  TOPIC_SOLVED

Quadratic equations and inequalities, variation equations, function notation, systems of equations, etc.

Combinations and Compositions of Functions: confused with Q

Postby pbro on Thu Apr 12, 2012 10:06 am

Hi
There's a question in my book which I am confused with. I have gone through my textbook and haven't found similar example questions and am hoping someone can set me off in the right direction.

The Question:
If f(2)=0, g(2)=8, and h(2)=-1, then calculate the value of the following functions at x=2.
a) (3f+4g) (2)

Do they mean that f(2)=0 is at x=2 and we just substitute the f into the question? I couldn't think of anything else but I'm almost definitely sure that that's wrong. Where does the x=2 come into play?

cheers
confused
pbro
 
Posts: 2
Joined: Thu Apr 12, 2012 9:55 am

Sponsor

Sponsor
 

Re: Combinations and Compositions of Functions: confused wit  TOPIC_SOLVED

Postby maggiemagnet on Thu Apr 12, 2012 11:42 am

pbro wrote:If f(2)=0, g(2)=8, and h(2)=-1, then calculate the value of the following functions at x=2.
a) (3f+4g) (2)

Do they mean that f(2)=0 is at x=2 and we just substitute the f into the question?

Yes. They're using something called "function notation". You can learn what that is and how to use it in this lesson.

In the same way, by "g(2)=8", they mean that g(x) = 8 when x = 2, so plug that into the equation, too.
:clap:
User avatar
maggiemagnet
 
Posts: 294
Joined: Mon Dec 08, 2008 12:32 am

Re: Combinations and Compositions of Functions: confused wit

Postby pbro on Thu Apr 12, 2012 4:00 pm

Thanks for the quick reply. It just seemed too easy for me as the stuff we did before was at a higher level. I'll def go through your link though.
Thanks again!
pbro
 
Posts: 2
Joined: Thu Apr 12, 2012 9:55 am


Return to Intermediate Algebra