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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
4*d+1/d+9 = -3/(-2) // + -3/(-2)
4*d+1/d-(-3/(-2))+9 = 0
4*d+1/d-3/2+9 = 0
4*d^1+1*d^-1+15/2*d^0 = 0
(4*d^2+15/2*d^1+1*d^0)/(d^1) = 0 // * d^2
d^1*(4*d^2+15/2*d^1+1*d^0) = 0
d^1
4*d^2+(15/2)*d+1 = 0
4*d^2+(15/2)*d+1 = 0
DELTA = (15/2)^2-(1*4*4)
DELTA = 161/4
DELTA > 0
d = ((161/4)^(1/2)-(15/2))/(2*4) or d = (-(15/2)-(161/4)^(1/2))/(2*4)
d = ((161/4)^(1/2)-15/2)/8 or d = (-((161/4)^(1/2)+15/2))/8
d in { (-((161/4)^(1/2)+15/2))/8, ((161/4)^(1/2)-15/2)/8}
d in { (-((161/4)^(1/2)+15/2))/8, ((161/4)^(1/2)-15/2)/8 }
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