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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)
9*x+x/(x^2)+20 = 0
9*x^1+1*x^-1+20*x^0 = 0
(9*x^2+20*x^1+1*x^0)/(x^1) = 0 // * x^2
x^1*(9*x^2+20*x^1+1*x^0) = 0
x^1
9*x^2+20*x+1 = 0
9*x^2+20*x+1 = 0
DELTA = 20^2-(1*4*9)
DELTA = 400-36
DELTA = 364
DELTA > 0
x = ((400-36)^(1/2)-20)/(2*9) or x = (-(400-36)^(1/2)-20)/(2*9)
x = ((400-36)^(1/2)-20)/18 or x = (-((400-36)^(1/2)+20))/18
x in { (-((400-36)^(1/2)+20))/18, ((400-36)^(1/2)-20)/18}
x in { (-((400-36)^(1/2)+20))/18, ((400-36)^(1/2)-20)/18 }
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