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D( u )
2*u^2-(8*u) = 0
2*u^2-(8*u) = 0
2*u^2-(8*u) = 0
2*u^2-8*u = 0
2*u^2-8*u = 0
DELTA = (-8)^2-(0*2*4)
DELTA = 64
DELTA > 0
u = (64^(1/2)+8)/(2*2) or u = (8-64^(1/2))/(2*2)
u = 4 or u = 0
u in (-oo:0) U (0:4) U (4:+oo)
(6*u^2-(14*u))/(2*u^2-(8*u)) = 0
(6*u^2-14*u)/(2*u^2-8*u) = 0
6*u^2-14*u = 0
2*u*(3*u-7) = 0
3*u-7 = 0 // + 7
3*u = 7 // : 3
u = 7/3
2*u*(u-7/3) = 0
2*u^2-8*u = 0
2*u*(u-4) = 0
u-4 = 0 // + 4
u = 4
2*u*(u-4) = 0
(2*u*(u-7/3))/(2*u*(u-4)) = 0
( 2*u )
2*u = 0 // : 2
u = 0
( u-7/3 )
u-7/3 = 0 // + 7/3
u = 7/3
u in { 0}
u = 7/3
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