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D( x )
x = 0
x^2 = 0
x = 0
x = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x-(2/x)+2/(x^2)-9-3+3 = 0
1/x-2*x^-1+2/(x^2)-9-3+3 = 0
2*x^-2-x^-1-9 = 0
t_1 = x^-1
2*t_1^2-1*t_1^1-9 = 0
2*t_1^2-t_1-9 = 0
DELTA = (-1)^2-(-9*2*4)
DELTA = 73
DELTA > 0
t_1 = (73^(1/2)+1)/(2*2) or t_1 = (1-73^(1/2))/(2*2)
t_1 = (73^(1/2)+1)/4 or t_1 = (1-73^(1/2))/4
t_1 = (1-73^(1/2))/4
x^-1-((1-73^(1/2))/4) = 0
1*x^-1 = (1-73^(1/2))/4 // : 1
x^-1 = (1-73^(1/2))/4
-1 < 0
1/(x^1) = (1-73^(1/2))/4 // * x^1
1 = ((1-73^(1/2))/4)*x^1 // : (1-73^(1/2))/4
4*(1-73^(1/2))^-1 = x^1
x = 4*(1-73^(1/2))^-1
t_1 = (73^(1/2)+1)/4
x^-1-((73^(1/2)+1)/4) = 0
1*x^-1 = (73^(1/2)+1)/4 // : 1
x^-1 = (73^(1/2)+1)/4
-1 < 0
1/(x^1) = (73^(1/2)+1)/4 // * x^1
1 = ((73^(1/2)+1)/4)*x^1 // : (73^(1/2)+1)/4
4*(73^(1/2)+1)^-1 = x^1
x = 4*(73^(1/2)+1)^-1
x in { 4*(1-73^(1/2))^-1, 4*(73^(1/2)+1)^-1 }
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