4i-15/i

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Solution for 4i-15/i equation: 


D( i )

i = 0

i = 0

i = 0

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

4*i-(15/i) = 0

4*i-15*i^-1 = 0

4*i^1-15*i^-1 = 0

(4*i^2-15*i^0)/(i^1) = 0 // * i^2

i^1*(4*i^2-15*i^0) = 0

i^1

4*i^2-15 = 0

4*i^2-15 = 0

DELTA = 0^2-(-15*4*4)

DELTA = 240

DELTA > 0

i = (240^(1/2)+0)/(2*4) or i = (0-240^(1/2))/(2*4)

i = (1*15^(1/2))/2 or i = (-15^(1/2))/2

i in { (-15^(1/2))/2, (1*15^(1/2))/2} 

i in { (-15^(1/2))/2, (1*15^(1/2))/2 }

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