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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x-(x/2) = 3 // - 3
1/x-(x/2)-3 = 0
1*x^-1-1/2*x^1-3*x^0 = 0
(1*x^0-1/2*x^2-3*x^1)/(x^1) = 0 // * x^2
x^1*(1*x^0-1/2*x^2-3*x^1) = 0
x^1
(-1/2)*x^2-3*x+1 = 0
(-1/2)*x^2-3*x+1 = 0
DELTA = (-3)^2-(1*4*(-1/2))
DELTA = 11
DELTA > 0
x = (11^(1/2)+3)/(2*(-1/2)) or x = (3-11^(1/2))/(2*(-1/2))
x = -(11^(1/2)+3) or x = 11^(1/2)-3
x in { -(11^(1/2)+3), 11^(1/2)-3}
x in { -(11^(1/2)+3), 11^(1/2)-3 }
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