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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15*x-(23/x) = 41 // - 41
15*x-(23/x)-41 = 0
15*x-23*x^-1-41 = 0
15*x^1-23*x^-1-41*x^0 = 0
(15*x^2-41*x^1-23*x^0)/(x^1) = 0 // * x^2
x^1*(15*x^2-41*x^1-23*x^0) = 0
x^1
15*x^2-41*x-23 = 0
15*x^2-41*x-23 = 0
DELTA = (-41)^2-(-23*4*15)
DELTA = 3061
DELTA > 0
x = (3061^(1/2)+41)/(2*15) or x = (41-3061^(1/2))/(2*15)
x = (3061^(1/2)+41)/30 or x = (41-3061^(1/2))/30
x in { (41-3061^(1/2))/30, (3061^(1/2)+41)/30}
x in { (41-3061^(1/2))/30, (3061^(1/2)+41)/30 }
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