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D( w )
w^2-(11*w)+28 = 0
w^2-(11*w)+28 = 0
w^2-(11*w)+28 = 0
w^2-11*w+28 = 0
w^2-11*w+28 = 0
DELTA = (-11)^2-(1*4*28)
DELTA = 9
DELTA > 0
w = (9^(1/2)+11)/(1*2) or w = (11-9^(1/2))/(1*2)
w = 7 or w = 4
w in (-oo:4) U (4:7) U (7:+oo)
(w^2+5*w-6)/(w^2-(11*w)+28) = 0
(w^2+5*w-6)/(w^2-11*w+28) = 0
w^2+5*w-6 = 0
w^2+5*w-6 = 0
DELTA = 5^2-(-6*1*4)
DELTA = 49
DELTA > 0
w = (49^(1/2)-5)/(1*2) or w = (-49^(1/2)-5)/(1*2)
w = 1 or w = -6
(w+6)*(w-1) = 0
w^2-11*w+28 = 0
w^2-11*w+28 = 0
DELTA = (-11)^2-(1*4*28)
DELTA = 9
DELTA > 0
w = (9^(1/2)+11)/(1*2) or w = (11-9^(1/2))/(1*2)
w = 7 or w = 4
(w-4)*(w-7) = 0
((w+6)*(w-1))/((w-4)*(w-7)) = 0
( w+6 )
w+6 = 0 // - 6
w = -6
( w-1 )
w-1 = 0 // + 1
w = 1
w in { -6, 1 }
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