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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
3/4-(1/b) = -3*b // + -3*b
3/4-(-3*b)-(1/b) = 0
3*b-b^-1+3/4 = 0
3*b^1-1*b^-1+3/4*b^0 = 0
(3*b^2+3/4*b^1-1*b^0)/(b^1) = 0 // * b^2
b^1*(3*b^2+3/4*b^1-1*b^0) = 0
b^1
3*b^2+(3/4)*b-1 = 0
3*b^2+(3/4)*b-1 = 0
DELTA = (3/4)^2-(-1*3*4)
DELTA = 201/16
DELTA > 0
b = ((201/16)^(1/2)-(3/4))/(2*3) or b = (-(3/4)-(201/16)^(1/2))/(2*3)
b = ((201/16)^(1/2)-3/4)/6 or b = (-((201/16)^(1/2)+3/4))/6
b in { (-((201/16)^(1/2)+3/4))/6, ((201/16)^(1/2)-3/4)/6}
b in { (-((201/16)^(1/2)+3/4))/6, ((201/16)^(1/2)-3/4)/6 }
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