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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
25/y = y/4 // - y/4
25/y-(y/4) = 0
25*y^-1-1/4*y^1 = 0
(25*y^0-1/4*y^2)/(y^1) = 0 // * y^2
y^1*(25*y^0-1/4*y^2) = 0
y^1
(-1/4)*y^2+25 = 0
(-1/4)*y^2+25 = 0
DELTA = 0^2-(4*25*(-1/4))
DELTA = 25
DELTA > 0
y = (25^(1/2)+0)/(2*(-1/4)) or y = (0-25^(1/2))/(2*(-1/4))
y = -10 or y = 10
y in { -10, 10}
y in { -10, 10 }
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