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D( u )
3*u^2-(30*u)+63 = 0
3*u^2-(30*u)+63 = 0
3*u^2-(30*u)+63 = 0
3*u^2-30*u+63 = 0
3*u^2-30*u+63 = 0
DELTA = (-30)^2-(3*4*63)
DELTA = 144
DELTA > 0
u = (144^(1/2)+30)/(2*3) or u = (30-144^(1/2))/(2*3)
u = 7 or u = 3
u in (-oo:3) U (3:7) U (7:+oo)
(u^2-(12*u)+35)/(3*u^2-(30*u)+63) = 0
(u^2-12*u+35)/(3*u^2-30*u+63) = 0
u^2-12*u+35 = 0
u^2-12*u+35 = 0
DELTA = (-12)^2-(1*4*35)
DELTA = 4
DELTA > 0
u = (4^(1/2)+12)/(1*2) or u = (12-4^(1/2))/(1*2)
u = 7 or u = 5
(u-5)*(u-7) = 0
3*u^2-30*u+63 = 0
3*(u^2-10*u+21) = 0
u^2-10*u+21 = 0
DELTA = (-10)^2-(1*4*21)
DELTA = 16
DELTA > 0
u = (16^(1/2)+10)/(1*2) or u = (10-16^(1/2))/(1*2)
u = 7 or u = 3
3*(u-3)*(u-7) = 0
((u-5)*(u-7))/(3*(u-3)*(u-7)) = 0
( u-5 )
u-5 = 0 // + 5
u = 5
( u-7 )
u-7 = 0 // + 7
u = 7
u in { 7}
u = 5
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