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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(7*y-(14/y)+1)*(y^2+2*y-((8/2)*y)+2) = 0
(7*y-14*y^-1+1)*(y^2+2*y-4*y+2) = 0
(7*y-14*y^-1+1)*(y^2-2*y+2) = 0
7*y-14*y^-1+1 = 0
7*y^1-14*y^-1+1*y^0 = 0
(7*y^2+1*y^1-14*y^0)/(y^1) = 0 // * y^2
y^1*(7*y^2+1*y^1-14*y^0) = 0
y^1
7*y^2+y-14 = 0
7*y^2+y-14 = 0
DELTA = 1^2-(-14*4*7)
DELTA = 393
DELTA > 0
y = (393^(1/2)-1)/(2*7) or y = (-393^(1/2)-1)/(2*7)
y = (393^(1/2)-1)/14 or y = (-(393^(1/2)+1))/14
y in { (-(393^(1/2)+1))/14, (393^(1/2)-1)/14}
(y+(393^(1/2)+1)/14)*(y-((393^(1/2)-1)/14)) = 0
y^2-2*y+2 = 0
y^2-2*y+2 = 0
DELTA = (-2)^2-(1*2*4)
DELTA = -4
DELTA < 0
1 = 0
(y+(393^(1/2)+1)/14)*(y-((393^(1/2)-1)/14)) = 0
( y+(393^(1/2)+1)/14 )
y+(393^(1/2)+1)/14 = 0 // - (393^(1/2)+1)/14
y = -((393^(1/2)+1)/14)
( y-((393^(1/2)-1)/14) )
y-((393^(1/2)-1)/14) = 0 // + (393^(1/2)-1)/14
y = (393^(1/2)-1)/14
y in { -((393^(1/2)+1)/14), (393^(1/2)-1)/14 }
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