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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)
x/(x^2)-(5*x)-6 = 0
x/(x^2)-5*x-6 = 0
1*x^-1-5*x^1-6*x^0 = 0
(1*x^0-5*x^2-6*x^1)/(x^1) = 0 // * x^2
x^1*(1*x^0-5*x^2-6*x^1) = 0
x^1
1-5*x^2-6*x = 0
1-5*x^2-6*x = 0
DELTA = (-6)^2-(-5*1*4)
DELTA = 56
DELTA > 0
x = (56^(1/2)+6)/(-5*2) or x = (6-56^(1/2))/(-5*2)
x = (2*14^(1/2)+6)/(-10) or x = (6-2*14^(1/2))/(-10)
x in { (2*14^(1/2)+6)/(-10), (6-2*14^(1/2))/(-10)}
x in { (2*14^(1/2)+6)/(-10), (6-2*14^(1/2))/(-10) }
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