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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12/x = 36-(6*x) // - 36-(6*x)
6*x+12/x-36 = 0
6*x^1+12*x^-1-36*x^0 = 0
(6*x^2-36*x^1+12*x^0)/(x^1) = 0 // * x^2
x^1*(6*x^2-36*x^1+12*x^0) = 0
x^1
6*x^2-36*x+12 = 0
6*x^2-36*x+12 = 0
DELTA = (-36)^2-(4*6*12)
DELTA = 1008
DELTA > 0
x = (1008^(1/2)+36)/(2*6) or x = (36-1008^(1/2))/(2*6)
x = (12*7^(1/2)+36)/12 or x = (36-12*7^(1/2))/12
x in { (36-12*7^(1/2))/12, (12*7^(1/2)+36)/12}
x in { (36-12*7^(1/2))/12, (12*7^(1/2)+36)/12 }
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