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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)
12*x+x/(x^2)+35 = 0
12*x^1+1*x^-1+35*x^0 = 0
(12*x^2+35*x^1+1*x^0)/(x^1) = 0 // * x^2
x^1*(12*x^2+35*x^1+1*x^0) = 0
x^1
12*x^2+35*x+1 = 0
12*x^2+35*x+1 = 0
DELTA = 35^2-(1*4*12)
DELTA = 1177
DELTA > 0
x = (1177^(1/2)-35)/(2*12) or x = (-1177^(1/2)-35)/(2*12)
x = (1177^(1/2)-35)/24 or x = (-(1177^(1/2)+35))/24
x in { (-(1177^(1/2)+35))/24, (1177^(1/2)-35)/24}
x in { (-(1177^(1/2)+35))/24, (1177^(1/2)-35)/24 }
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