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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
2*x-(x/(x^2))-8+2 = 0
2*x-x^-1-8+2 = 0
2*x^1-1*x^-1-6*x^0 = 0
(2*x^2-6*x^1-1*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^2-6*x^1-1*x^0) = 0
x^1
2*x^2-6*x-1 = 0
2*x^2-6*x-1 = 0
DELTA = (-6)^2-(-1*2*4)
DELTA = 44
DELTA > 0
x = (44^(1/2)+6)/(2*2) or x = (6-44^(1/2))/(2*2)
x = (2*11^(1/2)+6)/4 or x = (6-2*11^(1/2))/4
x in { (6-2*11^(1/2))/4, (2*11^(1/2)+6)/4}
x in { (6-2*11^(1/2))/4, (2*11^(1/2)+6)/4 }
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