7/z^2-2/z

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Solution for 7/z^2-2/z equation: 


D( z )

z^2 = 0

z = 0

z^2 = 0

z^2 = 0

1*z^2 = 0 // : 1

z^2 = 0

z = 0

z = 0

z = 0

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

7/(z^2)-(2/z) = 0

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

7*z^-2-2*z^-1 = 0

t_1 = z^-1

7*t_1^2-2*t_1^1 = 0

7*t_1^2-2*t_1 = 0

DELTA = (-2)^2-(0*4*7)

DELTA = 4

DELTA > 0

t_1 = (4^(1/2)+2)/(2*7) or t_1 = (2-4^(1/2))/(2*7)

t_1 = 2/7 or t_1 = 0

t_1 = 0

z^-1+0 = 0

z^-1 = 0

1*z^-1 = 0 // : 1

z^-1 = 0

z należy do O

t_1 = 2/7

z^-1-2/7 = 0

1*z^-1 = 2/7 // : 1

z^-1 = 2/7

-1 < 0

1/(z^1) = 2/7 // * z^1

1 = 2/7*z^1 // : 2/7

7/2 = z^1

z = 7/2

z = 7/2

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