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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)
x-x-(3/x)+12/(x^2)-2+1 = 1-(x/x)+2 // - 1-(x/x)+2
x-x-(3/x)+12/(x^2)+x/x-2-2-1+1 = 0
x-x-3*x^-1+12/(x^2)+x/x-2-2-1+1 = 0
12*x^-2-3*x^-1-3 = 0
t_1 = x^-1
12*t_1^2-3*t_1^1-3 = 0
12*t_1^2-3*t_1-3 = 0
DELTA = (-3)^2-(-3*4*12)
DELTA = 153
DELTA > 0
t_1 = (153^(1/2)+3)/(2*12) or t_1 = (3-153^(1/2))/(2*12)
t_1 = (3*17^(1/2)+3)/24 or t_1 = (3-3*17^(1/2))/24
t_1 = (3-3*17^(1/2))/24
x^-1-((3-3*17^(1/2))/24) = 0
1*x^-1 = (3-3*17^(1/2))/24 // : 1
x^-1 = (3-3*17^(1/2))/24
-1 < 0
1/(x^1) = (3-3*17^(1/2))/24 // * x^1
1 = ((3-3*17^(1/2))/24)*x^1 // : (3-3*17^(1/2))/24
24*(3-3*17^(1/2))^-1 = x^1
x = 24*(3-3*17^(1/2))^-1
t_1 = (3*17^(1/2)+3)/24
x^-1-((3*17^(1/2)+3)/24) = 0
1*x^-1 = (3*17^(1/2)+3)/24 // : 1
x^-1 = (3*17^(1/2)+3)/24
-1 < 0
1/(x^1) = (3*17^(1/2)+3)/24 // * x^1
1 = ((3*17^(1/2)+3)/24)*x^1 // : (3*17^(1/2)+3)/24
24*(3*17^(1/2)+3)^-1 = x^1
x = 24*(3*17^(1/2)+3)^-1
x in { 24*(3-3*17^(1/2))^-1, 24*(3*17^(1/2)+3)^-1 }
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