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D( w )
27-(3*w^2) = 0
27-(3*w^2) = 0
27-(3*w^2) = 0
27-3*w^2 = 0
-3*w^2 = -27 // : -3
w^2 = 9
w^2 = 9 // ^ 1/2
abs(w) = 3
w = 3 or w = -3
w in (-oo:-3) U (-3:3) U (3:+oo)
(w^2-(10*w)+21)/(27-(3*w^2)) = 0
(w^2-10*w+21)/(27-3*w^2) = 0
w^2-10*w+21 = 0
w^2-10*w+21 = 0
DELTA = (-10)^2-(1*4*21)
DELTA = 16
DELTA > 0
w = (16^(1/2)+10)/(1*2) or w = (10-16^(1/2))/(1*2)
w = 7 or w = 3
(w-3)*(w-7) = 0
((w-3)*(w-7))/(27-3*w^2) = 0
( w-3 )
w-3 = 0 // + 3
w = 3
( w-7 )
w-7 = 0 // + 7
w = 7
w in { 3}
w = 7
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