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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)-(1/x)-12 = 0
1/(x^2)-x^-1-12 = 0
x^-2-x^-1-12 = 0
t_1 = x^-1
1*t_1^2-1*t_1^1-12 = 0
t_1^2-t_1-12 = 0
DELTA = (-1)^2-(-12*1*4)
DELTA = 49
DELTA > 0
t_1 = (49^(1/2)+1)/(1*2) or t_1 = (1-49^(1/2))/(1*2)
t_1 = 4 or t_1 = -3
t_1 = -3
x^-1+3 = 0
1*x^-1 = -3 // : 1
x^-1 = -3
-1 < 0
1/(x^1) = -3 // * x^1
1 = -3*x^1 // : -3
-1/3 = x^1
x = -1/3
t_1 = 4
x^-1-4 = 0
1*x^-1 = 4 // : 1
x^-1 = 4
-1 < 0
1/(x^1) = 4 // * x^1
1 = 4*x^1 // : 4
1/4 = x^1
x = 1/4
x in { -1/3, 1/4 }
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