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D( w )
w^2-(5*w)-14 = 0
w^2-(5*w)-14 = 0
w^2-(5*w)-14 = 0
w^2-5*w-14 = 0
w^2-5*w-14 = 0
DELTA = (-5)^2-(-14*1*4)
DELTA = 81
DELTA > 0
w = (81^(1/2)+5)/(1*2) or w = (5-81^(1/2))/(1*2)
w = 7 or w = -2
w in (-oo:-2) U (-2:7) U (7:+oo)
(5*w^2-(10*w)-175)/(w^2-(5*w)-14) = 0
(5*w^2-10*w-175)/(w^2-5*w-14) = 0
5*w^2-10*w-175 = 0
5*(w^2-2*w-35) = 0
w^2-2*w-35 = 0
DELTA = (-2)^2-(-35*1*4)
DELTA = 144
DELTA > 0
w = (144^(1/2)+2)/(1*2) or w = (2-144^(1/2))/(1*2)
w = 7 or w = -5
5*(w+5)*(w-7) = 0
w^2-5*w-14 = 0
w^2-5*w-14 = 0
DELTA = (-5)^2-(-14*1*4)
DELTA = 81
DELTA > 0
w = (81^(1/2)+5)/(1*2) or w = (5-81^(1/2))/(1*2)
w = 7 or w = -2
(w+2)*(w-7) = 0
(5*(w+5)*(w-7))/((w+2)*(w-7)) = 0
( w+5 )
w+5 = 0 // - 5
w = -5
( w-7 )
w-7 = 0 // + 7
w = 7
w in { 7}
w = -5
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