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-   -   Break-Even Point to Cost/Revenue problem (http://www.chiefdelphi.com/forums/showthread.php?t=58609)

edure 01-09-2007 14:18

Break-Even Point to Cost/Revenue problem
 
Anyone has any suggestion on solving this problem for x?
It's a break even point to a cost and revenue problem.

5.5 sqrt(x) + 10000 = 3.29x where x>o

thanks

Kevin Sevcik 01-09-2007 14:58

Re: Break-Even Point to Cost/Revenue problem
 
put everything on the right side of the equation and treat it as a quadratic. If it helps you come to grips with it better, make yourself a dummy variable "a". Let a=sqrt(x). So a^2 = x. And then it's a straight forward quadratic.

edure 01-09-2007 15:54

Re: Break-Even Point to Cost/Revenue problem
 
thanks for the suggestion kevin. very clever, but it didnt work. i ended up w/ x~54.3.
the proposed solution is x~3133.

Kevin Sevcik 01-09-2007 16:13

Re: Break-Even Point to Cost/Revenue problem
 
I refuse to be wrong on my birthday. Also, I ran the numbers and got a = sqrt(x) = 55.63. So x = 3095.6. Mostly, you forgot that that quadratic solves for sqrt(x) so you need to square the answer to actually get x.

edure 01-09-2007 16:45

Re: Break-Even Point to Cost/Revenue problem
 
:) YOU'RE THE MAN KEVIN, that's it!!!!
many thanks....happy birthday!


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