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I = ingreso
I = 20x - x^2
I = S/. 100
x = ?
Solución.-
100 = 20x - x^2
x^2 - 20x + 100 = 0
x - 10
x - 10
x - 10 = 0
x = 10
Rpta.- Deben venderse 10 unidades.