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D( u )
2*u^2-(14*u)+20 = 0
2*u^2-(14*u)+20 = 0
2*u^2-(14*u)+20 = 0
2*u^2-14*u+20 = 0
2*u^2-14*u+20 = 0
DELTA = (-14)^2-(2*4*20)
DELTA = 36
DELTA > 0
u = (36^(1/2)+14)/(2*2) or u = (14-36^(1/2))/(2*2)
u = 5 or u = 2
u in (-oo:2) U (2:5) U (5:+oo)
(u^2+3*u-40)/(2*u^2-(14*u)+20) = 0
(u^2+3*u-40)/(2*u^2-14*u+20) = 0
u^2+3*u-40 = 0
u^2+3*u-40 = 0
DELTA = 3^2-(-40*1*4)
DELTA = 169
DELTA > 0
u = (169^(1/2)-3)/(1*2) or u = (-169^(1/2)-3)/(1*2)
u = 5 or u = -8
(u+8)*(u-5) = 0
2*u^2-14*u+20 = 0
2*(u^2-7*u+10) = 0
u^2-7*u+10 = 0
DELTA = (-7)^2-(1*4*10)
DELTA = 9
DELTA > 0
u = (9^(1/2)+7)/(1*2) or u = (7-9^(1/2))/(1*2)
u = 5 or u = 2
2*(u-2)*(u-5) = 0
((u+8)*(u-5))/(2*(u-2)*(u-5)) = 0
( u+8 )
u+8 = 0 // - 8
u = -8
( u-5 )
u-5 = 0 // + 5
u = 5
u in { 5}
u = -8
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