Posted by **Erin** on Monday, October 17, 2011 at 4:56pm.

The profit p(x) of a cosmetics company , in thousands of dollars . is given by p(x) =-5t^2=400x-2550, where x is the amount spent on advertising in thousands of dollars

a) determine the maximum profit the company can make

b) dtermine the amount spent on advertising that will result in the maximum profit

c) what amount must be spent on advertising to obtain a profit of at least $ 4 000 000

- Math( help please ! ) -
**Reiny**, Monday, October 17, 2011 at 6:11pm
Your equation makes no sense, make sure you read what you typed before posting.

- Math( help please ! ) -
**Sharlene**, Sunday, July 7, 2013 at 5:10pm
a. Complete the square.

-5x^2 + 400x - 2550

= -5(x^2 - 80x) - 2550

= -5(x^2 - 80x + 1600 - 1600) - 2550

= -5(x + 40)^2 + 8000 - 2550

= -5(x + 40)^2 + 5450

5450 x 1000 = $5,450,000

b. x = 40

40 x 1000 = $40000

c. Between $22 971 & 57 029

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