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D( b )
b-3 = 0
b-3 = 0
b-3 = 0
b-3 = 0 // + 3
b = 3
b in (-oo:3) U (3:+oo)
(3*b^2+3*b-5)/(b-3) = 0
3*b^2+3*b-5 = 0
3*b^2+3*b-5 = 0
DELTA = 3^2-(-5*3*4)
DELTA = 69
DELTA > 0
b = (69^(1/2)-3)/(2*3) or b = (-69^(1/2)-3)/(2*3)
b = (69^(1/2)-3)/6 or b = (-(69^(1/2)+3))/6
(b+(69^(1/2)+3)/6)*(b-((69^(1/2)-3)/6)) = 0
((b+(69^(1/2)+3)/6)*(b-((69^(1/2)-3)/6)))/(b-3) = 0
( b+(69^(1/2)+3)/6 )
b+(69^(1/2)+3)/6 = 0 // - (69^(1/2)+3)/6
b = -((69^(1/2)+3)/6)
( b-((69^(1/2)-3)/6) )
b-((69^(1/2)-3)/6) = 0 // + (69^(1/2)-3)/6
b = (69^(1/2)-3)/6
b in { -((69^(1/2)+3)/6), (69^(1/2)-3)/6 }
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