d-5/d-9

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Solution for d-5/d-9 equation: 


D( d )

d = 0

d = 0

d = 0

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

d-(5/d)-9 = 0

d-5*d^-1-9 = 0

1*d^1-5*d^-1-9*d^0 = 0

(1*d^2-9*d^1-5*d^0)/(d^1) = 0 // * d^2

d^1*(1*d^2-9*d^1-5*d^0) = 0

d^1

d^2-9*d-5 = 0

d^2-9*d-5 = 0

DELTA = (-9)^2-(-5*1*4)

DELTA = 101

DELTA > 0

d = (101^(1/2)+9)/(1*2) or d = (9-101^(1/2))/(1*2)

d = (101^(1/2)+9)/2 or d = (9-101^(1/2))/2

d in { (9-101^(1/2))/2, (101^(1/2)+9)/2} 

d in { (9-101^(1/2))/2, (101^(1/2)+9)/2 }

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