b-7/b-1

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Solution for b-7/b-1 equation: 


D( b )

b = 0

b = 0

b = 0

b in (-oo:0) U (0:+oo)

b-(7/b)-1 = 0

b-7*b^-1-1 = 0

1*b^1-7*b^-1-1*b^0 = 0

(1*b^2-1*b^1-7*b^0)/(b^1) = 0 // * b^2

b^1*(1*b^2-1*b^1-7*b^0) = 0

b^1

b^2-b-7 = 0

b^2-b-7 = 0

DELTA = (-1)^2-(-7*1*4)

DELTA = 29

DELTA > 0

b = (29^(1/2)+1)/(1*2) or b = (1-29^(1/2))/(1*2)

b = (29^(1/2)+1)/2 or b = (1-29^(1/2))/2

b in { (1-29^(1/2))/2, (29^(1/2)+1)/2} 

b in { (1-29^(1/2))/2, (29^(1/2)+1)/2 }

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