Discussion:  Roundtable 
Topic:  Teaching the Concept of Functions 
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Subject:  RE: Teaching the Concept of Functions 
Author:  Susan 
Date:  Sep 24 2004 
>
Then the students
> begin to see the slickness of the idea of
> functions. They even begin
> to make jokes with it. "My anger is a
> function of the number of
> jelly beans that my brother took from
> my lunch ..."
Now this is a great idea to go with. The degree to
> which I retaliate is a function of my anger. So now we have a
> composite function.
I think this will help the kids get the idea of composition, but they really
start getting confused when they have to compose a formula...
Even a simple one like f(x)=2x3 and g(x) = 4x^21, and asked to find
f(g(x)). Often they will start out with 2x(4x^21)3. How can we help them
write formulas? Can we extend some of the anaologies to help with formula
writing?
 
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