28/y-(11-y)

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Solution for 28/y-(11-y) equation: 


D( y )

y = 0

y = 0

y = 0

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

y+28/y-11 = 0

1*y^1+28*y^-1-11*y^0 = 0

(1*y^2-11*y^1+28*y^0)/(y^1) = 0 // * y^2

y^1*(1*y^2-11*y^1+28*y^0) = 0

y^1

y^2-11*y+28 = 0

y^2-11*y+28 = 0

DELTA = (-11)^2-(1*4*28)

DELTA = 9

DELTA > 0

y = (9^(1/2)+11)/(1*2) or y = (11-9^(1/2))/(1*2)

y = 7 or y = 4

y in { 4, 7} 

y in { 4, 7 }

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