(-2/y-7)-(7/7-y)

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Solution for (-2/y-7)-(7/7-y) equation: 


D( y )

y = 0

y = 0

y = 0

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

y-2/y-(7/7)-7 = 0

y-2/y-7-1 = 0

1*y^1-2*y^-1-8*y^0 = 0

(1*y^2-8*y^1-2*y^0)/(y^1) = 0 // * y^2

y^1*(1*y^2-8*y^1-2*y^0) = 0

y^1

y^2-8*y-2 = 0

y^2-8*y-2 = 0

DELTA = (-8)^2-(-2*1*4)

DELTA = 72

DELTA > 0

y = (72^(1/2)+8)/(1*2) or y = (8-72^(1/2))/(1*2)

y = (6*2^(1/2)+8)/2 or y = (8-6*2^(1/2))/2

y in { (8-6*2^(1/2))/2, (6*2^(1/2)+8)/2} 

y in { (8-6*2^(1/2))/2, (6*2^(1/2)+8)/2 }

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