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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/2-(12/x) = 1 // - 1
x/2-(12/x)-1 = 0
x/2-12*x^-1-1 = 0
1/2*x^1-12*x^-1-1*x^0 = 0
(1/2*x^2-1*x^1-12*x^0)/(x^1) = 0 // * x^2
x^1*(1/2*x^2-1*x^1-12*x^0) = 0
x^1
(1/2)*x^2-x-12 = 0
(1/2)*x^2-x-12 = 0
DELTA = (-1)^2-(-12*4*(1/2))
DELTA = 25
DELTA > 0
x = (25^(1/2)+1)/(2*(1/2)) or x = (1-25^(1/2))/(2*(1/2))
x = 6 or x = -4
x in { -4, 6}
x in { -4, 6 }
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