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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
10/4 = b-(2/b) // - b-(2/b)
2/b-b+10/4 = 0
2*b^-1-1*b^1+5/2*b^0 = 0
(5/2*b^1-1*b^2+2*b^0)/(b^1) = 0 // * b^2
b^1*(5/2*b^1-1*b^2+2*b^0) = 0
b^1
(5/2)*b-b^2+2 = 0
(5/2)*b-b^2+2 = 0
DELTA = (5/2)^2-(-1*2*4)
DELTA = 57/4
DELTA > 0
b = ((57/4)^(1/2)-(5/2))/(-1*2) or b = (-(5/2)-(57/4)^(1/2))/(-1*2)
b = ((57/4)^(1/2)-5/2)/(-2) or b = ((57/4)^(1/2)+5/2)/2
b in { ((57/4)^(1/2)-5/2)/(-2), ((57/4)^(1/2)+5/2)/2}
b in { ((57/4)^(1/2)-5/2)/(-2), ((57/4)^(1/2)+5/2)/2 }
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