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D( y )
y^2+9*y+14 = 0
y^2+9*y+14 = 0
y^2+9*y+14 = 0
y^2+9*y+14 = 0
DELTA = 9^2-(1*4*14)
DELTA = 25
DELTA > 0
y = (25^(1/2)-9)/(1*2) or y = (-25^(1/2)-9)/(1*2)
y = -2 or y = -7
y in (-oo:-7) U (-7:-2) U (-2:+oo)
(y^2+4*y+4)/(y^2+9*y+14) = 0
y^2+4*y+4 = 0
y^2+4*y+4 = 0
DELTA = 4^2-(1*4*4)
DELTA = 0
y = -4/(1*2)
y = -2 or y = -2
(y+2)^2 = 0
y^2+9*y+14 = 0
y^2+9*y+14 = 0
DELTA = 9^2-(1*4*14)
DELTA = 25
DELTA > 0
y = (25^(1/2)-9)/(1*2) or y = (-25^(1/2)-9)/(1*2)
y = -2 or y = -7
(y+7)*(y+2) = 0
((y+2)^2)/((y+7)*(y+2)) = 0
y+2 = 0 // - 2
y = -2
y in { -2}
y belongs to the empty set
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