The profit from the production and sale of ipod players?

RACHEL

New member
In relation to functions. The profit from the production and sale of ipod players is given by the function P(x)=450x-0.1x2(squared)-2000 where x is the number of units produced and sold.
a) what is P(500)? Interpret this result.
This is what I have done so far on a:
P(500)= 450(500) x 0.1(500)2 (<-squared)- 200
=198000

b) what is the profit from the production of 4000 units? write this in function notation.
So I did:
450(4000)-0.1(4000)(squared)-2000
=198000

First of all, what the heck? How does that happen? how do I explain this. Any help would be appreciated.
 
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