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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
3/b-((1/5)*b) = 11 // - 11
3/b-((1/5)*b)-11 = 0
(-1/5)*b+3/b-11 = 0
3*b^-1-1/5*b^1-11*b^0 = 0
(3*b^0-1/5*b^2-11*b^1)/(b^1) = 0 // * b^2
b^1*(3*b^0-1/5*b^2-11*b^1) = 0
b^1
(-1/5)*b^2-11*b+3 = 0
(-1/5)*b^2-11*b+3 = 0
DELTA = (-11)^2-(3*4*(-1/5))
DELTA = 617/5
DELTA > 0
b = ((617/5)^(1/2)+11)/(2*(-1/5)) or b = (11-(617/5)^(1/2))/(2*(-1/5))
b = -5/2*((617/5)^(1/2)+11) or b = -5/2*(11-(617/5)^(1/2))
b in { -5/2*((617/5)^(1/2)+11), -5/2*(11-(617/5)^(1/2))}
b in { -5/2*((617/5)^(1/2)+11), -5/2*(11-(617/5)^(1/2)) }
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