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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
7/9 = y-(25/y)+29 // - y-(25/y)+29
25/y-y+7/9-29 = 0
25*y^-1-1*y^1-254/9*y^0 = 0
(25*y^0-1*y^2-254/9*y^1)/(y^1) = 0 // * y^2
y^1*(25*y^0-1*y^2-254/9*y^1) = 0
y^1
(-254/9)*y-y^2+25 = 0
(-254/9)*y-y^2+25 = 0
DELTA = (-254/9)^2-(-1*4*25)
DELTA = 72616/81
DELTA > 0
y = ((72616/81)^(1/2)-(-254/9))/(-1*2) or y = (-(-254/9)-(72616/81)^(1/2))/(-1*2)
y = ((72616/81)^(1/2)+254/9)/(-2) or y = (254/9-(72616/81)^(1/2))/(-2)
y in { ((72616/81)^(1/2)+254/9)/(-2), (254/9-(72616/81)^(1/2))/(-2)}
y in { ((72616/81)^(1/2)+254/9)/(-2), (254/9-(72616/81)^(1/2))/(-2) }
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