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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
6*y+3/11 = 15/y // - 15/y
6*y-(15/y)+3/11 = 0
6*y-15*y^-1+3/11 = 0
6*y^1-15*y^-1+3/11*y^0 = 0
(6*y^2+3/11*y^1-15*y^0)/(y^1) = 0 // * y^2
y^1*(6*y^2+3/11*y^1-15*y^0) = 0
y^1
6*y^2+(3/11)*y-15 = 0
6*y^2+(3/11)*y-15 = 0
DELTA = (3/11)^2-(-15*4*6)
DELTA = 43569/121
DELTA > 0
y = ((43569/121)^(1/2)-(3/11))/(2*6) or y = (-(3/11)-(43569/121)^(1/2))/(2*6)
y = ((43569/121)^(1/2)-3/11)/12 or y = (-((43569/121)^(1/2)+3/11))/12
y in { (-((43569/121)^(1/2)+3/11))/12, ((43569/121)^(1/2)-3/11)/12}
y in { (-((43569/121)^(1/2)+3/11))/12, ((43569/121)^(1/2)-3/11)/12 }
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