r^2+2r+(1-980/500)

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Solution for r^2+2r+(1-980/500) equation: 


r in (-oo:+oo)

r^2+2*r-(980/500)+1 = 0

r^2+2*r-49/25+1 = 0

r^2+2*r-24/25 = 0

DELTA = 2^2-(-24/25*1*4)

DELTA = 196/25

DELTA > 0

r = ((196/25)^(1/2)-2)/(1*2) or r = (-(196/25)^(1/2)-2)/(1*2)

r = 2/5 or r = -12/5

r in { -12/5, 2/5 }

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