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The profit P, in dollars, gained by selling X computers is modeled by the equation P+-5X^2+1000x+5000. How many computers must be sold to obtain a profit of 55,000

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well, you have the formula, so just solve

-5x^2 + 1000x + 5000 = 55000
x^2 - 200x + 1000 = 0
(x-100)^2 = 0
x = 100

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