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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
440-(2*x)-(5000/x) = 0
440-2*x-5000*x^-1 = 0
440*x^0-2*x^1-5000*x^-1 = 0
(440*x^1-2*x^2-5000*x^0)/(x^1) = 0 // * x^2
x^1*(440*x^1-2*x^2-5000*x^0) = 0
x^1
440*x-2*x^2-5000 = 0
440*x-2*x^2-5000 = 0
DELTA = 440^2-(-5000*(-2)*4)
DELTA = 153600
DELTA > 0
x = (153600^(1/2)-440)/(-2*2) or x = (-153600^(1/2)-440)/(-2*2)
x = (160*6^(1/2)-440)/(-4) or x = (-160*6^(1/2)-440)/(-4)
x in { (160*6^(1/2)-440)/(-4), (-160*6^(1/2)-440)/(-4)}
x in { (160*6^(1/2)-440)/(-4), (-160*6^(1/2)-440)/(-4) }
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