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D( r )
r = 0
r = 0
r = 0
r in (-oo:0) U (0:+oo)
24 = (6/r)/1-r // - (6/r)/1-r
r-((6/r)/1)+24 = 0
r-6*r^-1+24 = 0
1*r^1-6*r^-1+24*r^0 = 0
(1*r^2+24*r^1-6*r^0)/(r^1) = 0 // * r^2
r^1*(1*r^2+24*r^1-6*r^0) = 0
r^1
r^2+24*r-6 = 0
r^2+24*r-6 = 0
DELTA = 24^2-(-6*1*4)
DELTA = 600
DELTA > 0
r = (600^(1/2)-24)/(1*2) or r = (-600^(1/2)-24)/(1*2)
r = (10*6^(1/2)-24)/2 or r = (-10*6^(1/2)-24)/2
r in { (-10*6^(1/2)-24)/2, (10*6^(1/2)-24)/2}
r in { (-10*6^(1/2)-24)/2, (10*6^(1/2)-24)/2 }
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