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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(3*(y^2-25))/y-5 = 0
(3*(y^2-25))/y+(-5*y)/y = 0
3*(y^2-25)-5*y = 0
3*y^2-5*y-75 = 0
3*y^2-5*y-75 = 0
3*y^2-5*y-75 = 0
DELTA = (-5)^2-(-75*3*4)
DELTA = 925
DELTA > 0
y = (925^(1/2)+5)/(2*3) or y = (5-925^(1/2))/(2*3)
y = (5*37^(1/2)+5)/6 or y = (5-5*37^(1/2))/6
(y-((5-5*37^(1/2))/6))*(y-((5*37^(1/2)+5)/6)) = 0
((y-((5-5*37^(1/2))/6))*(y-((5*37^(1/2)+5)/6)))/y = 0
((y-((5-5*37^(1/2))/6))*(y-((5*37^(1/2)+5)/6)))/y = 0 // * y
(y-((5-5*37^(1/2))/6))*(y-((5*37^(1/2)+5)/6)) = 0
( y-((5*37^(1/2)+5)/6) )
y-((5*37^(1/2)+5)/6) = 0 // + (5*37^(1/2)+5)/6
y = (5*37^(1/2)+5)/6
( y-((5-5*37^(1/2))/6) )
y-((5-5*37^(1/2))/6) = 0 // + (5-5*37^(1/2))/6
y = (5-5*37^(1/2))/6
y in { (5*37^(1/2)+5)/6, (5-5*37^(1/2))/6 }
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