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b in (-oo:+oo)
(b/2)*b-9 = 4*b+5 // - 4*b+5
(b/2)*b-(4*b)-9-5 = 0
(b/2)*b-4*b-9-5 = 0
1/2*b^2-4*b-14 = 0
DELTA = (-4)^2-(-14*1/2*4)
DELTA = 44
DELTA > 0
b = (44^(1/2)+4)/(1/2*2) or b = (4-44^(1/2))/(1/2*2)
b = 2*11^(1/2)+4 or b = 4-2*11^(1/2)
b in { 4-2*11^(1/2), 2*11^(1/2)+4 }
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