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D( u )
8-(2*u^2) = 0
8-(2*u^2) = 0
8-(2*u^2) = 0
8-2*u^2 = 0
-2*u^2 = -8 // : -2
u^2 = 4
u^2 = 4 // ^ 1/2
abs(u) = 2
u = 2 or u = -2
u in (-oo:-2) U (-2:2) U (2:+oo)
(u^2+5*u-14)/(8-(2*u^2)) = 0
(u^2+5*u-14)/(8-2*u^2) = 0
u^2+5*u-14 = 0
u^2+5*u-14 = 0
DELTA = 5^2-(-14*1*4)
DELTA = 81
DELTA > 0
u = (81^(1/2)-5)/(1*2) or u = (-81^(1/2)-5)/(1*2)
u = 2 or u = -7
(u+7)*(u-2) = 0
((u+7)*(u-2))/(8-2*u^2) = 0
( u+7 )
u+7 = 0 // - 7
u = -7
( u-2 )
u-2 = 0 // + 2
u = 2
u in { 2}
u = -7
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