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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+6*x-(17/x)-5 = -3 // + 3
x+6*x-(17/x)-5+3 = 0
x+6*x-17*x^-1-5+3 = 0
7*x^1-17*x^-1-2*x^0 = 0
(7*x^2-2*x^1-17*x^0)/(x^1) = 0 // * x^2
x^1*(7*x^2-2*x^1-17*x^0) = 0
x^1
7*x^2-2*x-17 = 0
7*x^2-2*x-17 = 0
DELTA = (-2)^2-(-17*4*7)
DELTA = 480
DELTA > 0
x = (480^(1/2)+2)/(2*7) or x = (2-480^(1/2))/(2*7)
x = (4*30^(1/2)+2)/14 or x = (2-4*30^(1/2))/14
x in { (2-4*30^(1/2))/14, (4*30^(1/2)+2)/14}
x in { (2-4*30^(1/2))/14, (4*30^(1/2)+2)/14 }
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