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April 1, 2015

April 1, 2015

Posted by **Carolyn** on Monday, April 23, 2012 at 7:06pm.

- Algebra 2 -
**Damon**, Monday, April 23, 2012 at 7:43pmYou have a sign mistake. Your profit goes to infinity as number of dolls go to infinity. However here is the method.

y = 3 x^2 + 720 x -17800

3 x^2 + 720 x = y + 17800

x^2 + 240 x = y/3 + 5933.33

x^2 + 240 x + 14400 = y/3 + 20333

(x+120)^2 = y/3 + 20333

minimum at x = -120

this is nonsense because your problem statement has a sign error.

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