-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 = 56

DELTA > 0

y = (56^(1/2)+8)/(-1*2) or y = (8-56^(1/2))/(-1*2)

y = (2*14^(1/2)+8)/(-2) or y = (8-2*14^(1/2))/(-2)

y in { (2*14^(1/2)+8)/(-2), (8-2*14^(1/2))/(-2)} 

y in { (2*14^(1/2)+8)/(-2), (8-2*14^(1/2))/(-2) }

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