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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)
5/x-(20/(x^2))-2+4 = 1 // - 1
5/x-(20/(x^2))-2-1+4 = 0
5/x-20*x^-2-2-1+4 = 0
5*x^-1-20*x^-2+1 = 0
t_1 = x^-1
5*t_1^1-20*t_1^2+1 = 0
5*t_1-20*t_1^2+1 = 0
DELTA = 5^2-(-20*1*4)
DELTA = 105
DELTA > 0
t_1 = (105^(1/2)-5)/(-20*2) or t_1 = (-105^(1/2)-5)/(-20*2)
t_1 = (105^(1/2)-5)/(-40) or t_1 = (105^(1/2)+5)/40
t_1 = (105^(1/2)-5)/(-40)
x^-1-((105^(1/2)-5)/(-40)) = 0
1*x^-1 = (105^(1/2)-5)/(-40) // : 1
x^-1 = (105^(1/2)-5)/(-40)
-1 < 0
1/(x^1) = (105^(1/2)-5)/(-40) // * x^1
1 = ((105^(1/2)-5)/(-40))*x^1 // : (105^(1/2)-5)/(-40)
-40*(105^(1/2)-5)^-1 = x^1
x = -40*(105^(1/2)-5)^-1
t_1 = (105^(1/2)+5)/40
x^-1-((105^(1/2)+5)/40) = 0
1*x^-1 = (105^(1/2)+5)/40 // : 1
x^-1 = (105^(1/2)+5)/40
-1 < 0
1/(x^1) = (105^(1/2)+5)/40 // * x^1
1 = ((105^(1/2)+5)/40)*x^1 // : (105^(1/2)+5)/40
40*(105^(1/2)+5)^-1 = x^1
x = 40*(105^(1/2)+5)^-1
x in { -40*(105^(1/2)-5)^-1, 40*(105^(1/2)+5)^-1 }
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