7/i-2/5-i

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Solution for 7/i-2/5-i equation: 


D( i )

i = 0

i = 0

i = 0

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

7/i-i-(2/5) = 0

7/i-i-2/5 = 0

7*i^-1-1*i^1-2/5*i^0 = 0

(7*i^0-1*i^2-2/5*i^1)/(i^1) = 0 // * i^2

i^1*(7*i^0-1*i^2-2/5*i^1) = 0

i^1

(-2/5)*i-i^2+7 = 0

(-2/5)*i-i^2+7 = 0

DELTA = (-2/5)^2-(-1*4*7)

DELTA = 704/25

DELTA > 0

i = ((704/25)^(1/2)-(-2/5))/(-1*2) or i = (-(-2/5)-(704/25)^(1/2))/(-1*2)

i = ((704/25)^(1/2)+2/5)/(-2) or i = (2/5-(704/25)^(1/2))/(-2)

i in { ((704/25)^(1/2)+2/5)/(-2), (2/5-(704/25)^(1/2))/(-2)} 

i in { ((704/25)^(1/2)+2/5)/(-2), (2/5-(704/25)^(1/2))/(-2) }

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