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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)
5*(-x)^2-(1/((-x)^2)) = 0
5*(-x)^2-x^-2 = 0
5*x^2-x^-2 = 0
t_1 = x^2
5*t_1^1-1*t_1^-1 = 0
5*t_1^1-1*t_1^-1 = 0
(5*t_1^2-1*t_1^0)/(t_1^1) = 0 // * t_1^2
t_1^1*(5*t_1^2-1*t_1^0) = 0
t_1^1
5*t_1^2-1 = 0
5*t_1^2-1 = 0
DELTA = 0^2-(-1*4*5)
DELTA = 20
DELTA > 0
t_1 = (20^(1/2)+0)/(2*5) or t_1 = (0-20^(1/2))/(2*5)
t_1 = (1*5^(1/2))/5 or t_1 = (-5^(1/2))/5
t_1 in { (-5^(1/2))/5, (1*5^(1/2))/5}
t_1 = (-5^(1/2))/5
x^2-((-5^(1/2))/5) = 0
1*x^2 = (-5^(1/2))/5 // : 1
x^2 = (-5^(1/2))/5
t_1 = (1*5^(1/2))/5
x^2-((1*5^(1/2))/5) = 0
x^2-((5^(1/2))/5) = 0
1*x^2 = (5^(1/2))/5 // : 1
x^2 = (5^(1/2))/5
x^2 = (5^(1/2))/5 // ^ 1/2
abs(x) = 5^(-1/4)
x = 5^(-1/4) or x = -5^(-1/4)
x in { 5^(-1/4), -5^(-1/4) }
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