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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
4/b-((1/2)*b) = -7/4 // + -7/4
4/b-((1/2)*b)-(-7/4) = 0
(-1/2)*b+4/b+7/4 = 0
4*b^-1-1/2*b^1+7/4*b^0 = 0
(7/4*b^1-1/2*b^2+4*b^0)/(b^1) = 0 // * b^2
b^1*(7/4*b^1-1/2*b^2+4*b^0) = 0
b^1
(-1/2)*b^2+(7/4)*b+4 = 0
(-1/2)*b^2+(7/4)*b+4 = 0
DELTA = (7/4)^2-(4*4*(-1/2))
DELTA = 177/16
DELTA > 0
b = ((177/16)^(1/2)-(7/4))/(2*(-1/2)) or b = (-(7/4)-(177/16)^(1/2))/(2*(-1/2))
b = 7/4-(177/16)^(1/2) or b = (177/16)^(1/2)+7/4
b in { 7/4-(177/16)^(1/2), (177/16)^(1/2)+7/4}
b in { 7/4-(177/16)^(1/2), (177/16)^(1/2)+7/4 }
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