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D( u )
u+2 = 0
u+2 = 0
u+2 = 0
u+2 = 0 // - 2
u = -2
u in (-oo:-2) U (-2:+oo)
(3*u)/(u+2)+u+2 = 0
(3*u)/(u+2)+(u*(u+2))/(u+2)+(2*(u+2))/(u+2) = 0
u*(u+2)+2*(u+2)+3*u = 0
u^2+5*u+2*u+4 = 0
u^2+7*u+4 = 0
u^2+7*u+4 = 0
u^2+7*u+4 = 0
DELTA = 7^2-(1*4*4)
DELTA = 33
DELTA > 0
u = (33^(1/2)-7)/(1*2) or u = (-33^(1/2)-7)/(1*2)
u = (33^(1/2)-7)/2 or u = (-(33^(1/2)+7))/2
(u+(33^(1/2)+7)/2)*(u-((33^(1/2)-7)/2)) = 0
((u+(33^(1/2)+7)/2)*(u-((33^(1/2)-7)/2)))/(u+2) = 0
((u+(33^(1/2)+7)/2)*(u-((33^(1/2)-7)/2)))/(u+2) = 0 // * u+2
(u+(33^(1/2)+7)/2)*(u-((33^(1/2)-7)/2)) = 0
( u+(33^(1/2)+7)/2 )
u+(33^(1/2)+7)/2 = 0 // - (33^(1/2)+7)/2
u = -((33^(1/2)+7)/2)
( u-((33^(1/2)-7)/2) )
u-((33^(1/2)-7)/2) = 0 // + (33^(1/2)-7)/2
u = (33^(1/2)-7)/2
u in { -((33^(1/2)+7)/2), (33^(1/2)-7)/2 }
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