The profit of an organization is calculated by the function P(x) = x2

Question

– 4000x + 7800000, where x is the number
of units sold. If the net profit is 3800000, find the number of items sold.
Thanks

Answer 1

well, just solve
x^2 - 4000x + 7800000 = 3800000
x^2 - 4000x + 4000000 = 0
(x-2000)^2 = 0
x = 2000

Answer 2

Thanks Steve.