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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)
2/(x^2)-(5/x) = 4 // - 4
2/(x^2)-(5/x)-4 = 0
2/(x^2)-5*x^-1-4 = 0
2*x^-2-5*x^-1-4 = 0
t_1 = x^-1
2*t_1^2-5*t_1^1-4 = 0
2*t_1^2-5*t_1-4 = 0
DELTA = (-5)^2-(-4*2*4)
DELTA = 57
DELTA > 0
t_1 = (57^(1/2)+5)/(2*2) or t_1 = (5-57^(1/2))/(2*2)
t_1 = (57^(1/2)+5)/4 or t_1 = (5-57^(1/2))/4
t_1 = (5-57^(1/2))/4
x^-1-((5-57^(1/2))/4) = 0
1*x^-1 = (5-57^(1/2))/4 // : 1
x^-1 = (5-57^(1/2))/4
-1 < 0
1/(x^1) = (5-57^(1/2))/4 // * x^1
1 = ((5-57^(1/2))/4)*x^1 // : (5-57^(1/2))/4
4*(5-57^(1/2))^-1 = x^1
x = 4*(5-57^(1/2))^-1
t_1 = (57^(1/2)+5)/4
x^-1-((57^(1/2)+5)/4) = 0
1*x^-1 = (57^(1/2)+5)/4 // : 1
x^-1 = (57^(1/2)+5)/4
-1 < 0
1/(x^1) = (57^(1/2)+5)/4 // * x^1
1 = ((57^(1/2)+5)/4)*x^1 // : (57^(1/2)+5)/4
4*(57^(1/2)+5)^-1 = x^1
x = 4*(57^(1/2)+5)^-1
x in { 4*(5-57^(1/2))^-1, 4*(57^(1/2)+5)^-1 }
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