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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
15-y = 15/y // - 15/y
15-y-(15/y) = 0
15-y-15*y^-1 = 0
15*y^0-1*y^1-15*y^-1 = 0
(15*y^1-1*y^2-15*y^0)/(y^1) = 0 // * y^2
y^1*(15*y^1-1*y^2-15*y^0) = 0
y^1
15*y-y^2-15 = 0
15*y-y^2-15 = 0
DELTA = 15^2-(-15*(-1)*4)
DELTA = 165
DELTA > 0
y = (165^(1/2)-15)/(-1*2) or y = (-165^(1/2)-15)/(-1*2)
y = (165^(1/2)-15)/(-2) or y = (165^(1/2)+15)/2
y in { (165^(1/2)-15)/(-2), (165^(1/2)+15)/2}
y in { (165^(1/2)-15)/(-2), (165^(1/2)+15)/2 }
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