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D( w )
w^2-(3*w)-28 = 0
w^2-(3*w)-28 = 0
w^2-(3*w)-28 = 0
w^2-3*w-28 = 0
w^2-3*w-28 = 0
DELTA = (-3)^2-(-28*1*4)
DELTA = 121
DELTA > 0
w = (121^(1/2)+3)/(1*2) or w = (3-121^(1/2))/(1*2)
w = 7 or w = -4
w in (-oo:-4) U (-4:7) U (7:+oo)
(2*w^2-(10*w)-28)/(w^2-(3*w)-28) = 0
(2*w^2-10*w-28)/(w^2-3*w-28) = 0
2*w^2-10*w-28 = 0
2*(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
2*(w+2)*(w-7) = 0
w^2-3*w-28 = 0
w^2-3*w-28 = 0
DELTA = (-3)^2-(-28*1*4)
DELTA = 121
DELTA > 0
w = (121^(1/2)+3)/(1*2) or w = (3-121^(1/2))/(1*2)
w = 7 or w = -4
(w+4)*(w-7) = 0
(2*(w+2)*(w-7))/((w+4)*(w-7)) = 0
( 2 )
2 = 0
w belongs to the empty set
( w+2 )
w+2 = 0 // - 2
w = -2
( w-7 )
w-7 = 0 // + 7
w = 7
w in { 7}
w = -2
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