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D( y )
y^2-(10*y) = 0
y^2-(10*y) = 0
y^2-(10*y) = 0
y^2-10*y = 0
y^2-10*y = 0
DELTA = (-10)^2-(0*1*4)
DELTA = 100
DELTA > 0
y = (100^(1/2)+10)/(1*2) or y = (10-100^(1/2))/(1*2)
y = 10 or y = 0
y in (-oo:0) U (0:10) U (10:+oo)
4/(y^2-(10*y)) = 0
4/(y^2-10*y) = 0
y^2-10*y = 0
y*(y-10) = 0
y-10 = 0 // + 10
y = 10
y*(y-10) = 0
4/(y*(y-10)) = 0
y belongs to the empty set
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