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D( u )
u = 0
u+5 = 0
u = 0
u = 0
u+5 = 0
u+5 = 0
u+5 = 0 // - 5
u = -5
u in (-oo:-5) U (-5:0) U (0:+oo)
2/u-((3*u)/(u+5))+4 = 0
2/u-3*u*(u+5)^-1+4 = 0
(-3*u)/(u+5)+2/u+4 = 0
(-3*u*u)/(u*(u+5))+(2*(u+5))/(u*(u+5))+(4*u*(u+5))/(u*(u+5)) = 0
2*(u+5)+4*u*(u+5)-3*u*u = 0
4*u^2-3*u^2+2*u+20*u+10 = 0
u^2+22*u+10 = 0
u^2+22*u+10 = 0
u^2+22*u+10 = 0
DELTA = 22^2-(1*4*10)
DELTA = 444
DELTA > 0
u = (444^(1/2)-22)/(1*2) or u = (-444^(1/2)-22)/(1*2)
u = (2*111^(1/2)-22)/2 or u = (-2*111^(1/2)-22)/2
(u-((-2*111^(1/2)-22)/2))*(u-((2*111^(1/2)-22)/2)) = 0
((u-((-2*111^(1/2)-22)/2))*(u-((2*111^(1/2)-22)/2)))/(u*(u+5)) = 0
((u-((-2*111^(1/2)-22)/2))*(u-((2*111^(1/2)-22)/2)))/(u*(u+5)) = 0 // * u*(u+5)
(u-((-2*111^(1/2)-22)/2))*(u-((2*111^(1/2)-22)/2)) = 0
( u-((-2*111^(1/2)-22)/2) )
u-((-2*111^(1/2)-22)/2) = 0 // + (-2*111^(1/2)-22)/2
u = (-2*111^(1/2)-22)/2
( u-((2*111^(1/2)-22)/2) )
u-((2*111^(1/2)-22)/2) = 0 // + (2*111^(1/2)-22)/2
u = (2*111^(1/2)-22)/2
u in { (-2*111^(1/2)-22)/2, (2*111^(1/2)-22)/2 }
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