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D( b )
b+5 = 0
b+5 = 0
b+5 = 0
b+5 = 0 // - 5
b = -5
b in (-oo:-5) U (-5:+oo)
(b^2+3*b-9)/(b+5) = 0
b^2+3*b-9 = 0
b^2+3*b-9 = 0
DELTA = 3^2-(-9*1*4)
DELTA = 45
DELTA > 0
b = (45^(1/2)-3)/(1*2) or b = (-45^(1/2)-3)/(1*2)
b = (3*5^(1/2)-3)/2 or b = (-3*5^(1/2)-3)/2
(b-((-3*5^(1/2)-3)/2))*(b-((3*5^(1/2)-3)/2)) = 0
((b-((-3*5^(1/2)-3)/2))*(b-((3*5^(1/2)-3)/2)))/(b+5) = 0
( b-((-3*5^(1/2)-3)/2) )
b-((-3*5^(1/2)-3)/2) = 0 // + (-3*5^(1/2)-3)/2
b = (-3*5^(1/2)-3)/2
( b-((3*5^(1/2)-3)/2) )
b-((3*5^(1/2)-3)/2) = 0 // + (3*5^(1/2)-3)/2
b = (3*5^(1/2)-3)/2
b in { (-3*5^(1/2)-3)/2, (3*5^(1/2)-3)/2 }
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