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D( r )
(r+1)^2 = 0
(r+1)^2 = 0
(r+1)^2 = 0
r+1 = 0 // - 1
r = -1
r in (-oo:-1) U (-1:+oo)
841 = 984/((r+1)^2) // - 984/((r+1)^2)
841-(984/((r+1)^2)) = 0
841-984*(r+1)^-2 = 0
841-984/((r+1)^2) = 0
(841*(r+1)^2)/((r+1)^2)-984/((r+1)^2) = 0
841*(r+1)^2-984 = 0
841*r^2+1682*r-143 = 0
841*r^2+1682*r-143 = 0
841*r^2+1682*r-143 = 0
DELTA = 1682^2-(-143*4*841)
DELTA = 3310176
DELTA > 0
r = (3310176^(1/2)-1682)/(2*841) or r = (-3310176^(1/2)-1682)/(2*841)
r = (116*246^(1/2)-1682)/1682 or r = (-116*246^(1/2)-1682)/1682
(r-((-116*246^(1/2)-1682)/1682))*(r-((116*246^(1/2)-1682)/1682)) = 0
((r-((-116*246^(1/2)-1682)/1682))*(r-((116*246^(1/2)-1682)/1682)))/((r+1)^2) = 0
((r-((-116*246^(1/2)-1682)/1682))*(r-((116*246^(1/2)-1682)/1682)))/((r+1)^2) = 0 // * (r+1)^2
(r-((-116*246^(1/2)-1682)/1682))*(r-((116*246^(1/2)-1682)/1682)) = 0
( r-((-116*246^(1/2)-1682)/1682) )
r-((-116*246^(1/2)-1682)/1682) = 0 // + (-116*246^(1/2)-1682)/1682
r = (-116*246^(1/2)-1682)/1682
( r-((116*246^(1/2)-1682)/1682) )
r-((116*246^(1/2)-1682)/1682) = 0 // + (116*246^(1/2)-1682)/1682
r = (116*246^(1/2)-1682)/1682
r in { (-116*246^(1/2)-1682)/1682, (116*246^(1/2)-1682)/1682 }
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