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Can anyone help me answer these two trigonometry math word problems and show all my work for both?

1. The profit of an organization is calculated by the function P(x) = x2 - 4000x + 7800000, where x is the number of units sold. If the net profit is 3800000, find the number of items sold.

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Jim S. | Physics (and math) are fun, reallyPhysics (and math) are fun, really
4.7 4.7 (185 lesson ratings) (185)
              We want to find the value of x that makes P(x) = 3,800,000. So we have 
3,800,000=x2-4000x+7,800,000, subtracting 3,800,000 from both sides
x2-4000x+4,000,000 = 0 The solution of this quadratic is x=2000 is the number of items sold