1/7z+9/z=1

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Solution for 1/7z+9/z=1 equation: 


D( z )

z = 0

z = 0

z = 0

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

(1/7)*z+9/z = 1 // - 1

(1/7)*z+9/z-1 = 0

1/7*z^1+9*z^-1-1*z^0 = 0

(1/7*z^2-1*z^1+9*z^0)/(z^1) = 0 // * z^2

z^1*(1/7*z^2-1*z^1+9*z^0) = 0

z^1

(1/7)*z^2-z+9 = 0

(1/7)*z^2-z+9 = 0

DELTA = (-1)^2-(4*9*(1/7))

DELTA = -29/7

DELTA < 0

z in { } 

z belongs to the empty set

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