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D( z )
z^2+5*z-14 = 0
z^2+5*z-14 = 0
z^2+5*z-14 = 0
z^2+5*z-14 = 0
DELTA = 5^2-(-14*1*4)
DELTA = 81
DELTA > 0
z = (81^(1/2)-5)/(1*2) or z = (-81^(1/2)-5)/(1*2)
z = 2 or z = -7
z in (-oo:-7) U (-7:2) U (2:+oo)
(z^2+5*z+6)/(z^2+5*z-14) = 0
z^2+5*z+6 = 0
z^2+5*z+6 = 0
DELTA = 5^2-(1*4*6)
DELTA = 1
DELTA > 0
z = (1^(1/2)-5)/(1*2) or z = (-1^(1/2)-5)/(1*2)
z = -2 or z = -3
(z+3)*(z+2) = 0
z^2+5*z-14 = 0
z^2+5*z-14 = 0
DELTA = 5^2-(-14*1*4)
DELTA = 81
DELTA > 0
z = (81^(1/2)-5)/(1*2) or z = (-81^(1/2)-5)/(1*2)
z = 2 or z = -7
(z+7)*(z-2) = 0
((z+3)*(z+2))/((z+7)*(z-2)) = 0
( z+2 )
z+2 = 0 // - 2
z = -2
( z+3 )
z+3 = 0 // - 3
z = -3
z in { -2, -3 }
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