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r in (-oo:+oo)
(1-(5*r))^2 = 36/25 // - 36/25
(1-(5*r))^2-(36/25) = 0
(1-5*r)^2-36/25 = 0
(25*(1-5*r)^2)/25-36/25 = 0
25*(1-5*r)^2-36 = 0
625*r^2-250*r-11 = 0
625*r^2-250*r-11 = 0
625*r^2-250*r-11 = 0
DELTA = (-250)^2-(-11*4*625)
DELTA = 90000
DELTA > 0
r = (90000^(1/2)+250)/(2*625) or r = (250-90000^(1/2))/(2*625)
r = 11/25 or r = -1/25
(r+1/25)*(r-11/25) = 0
((r+1/25)*(r-11/25))/25 = 0
((r+1/25)*(r-11/25))/25 = 0 // * 25
(r+1/25)*(r-11/25) = 0
( r+1/25 )
r+1/25 = 0 // - 1/25
r = -1/25
( r-11/25 )
r-11/25 = 0 // + 11/25
r = 11/25
r in { -1/25, 11/25 }
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