r^2-1/2r-1/2

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Solution for r^2-1/2r-1/2 equation: 


r in (-oo:+oo)

r^2-((1/2)*r)-(1/2) = 0

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

r^2-1/2*r-1/2 = 0

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

DELTA = 9/4

DELTA > 0

r = ((9/4)^(1/2)+1/2)/(1*2) or r = (1/2-(9/4)^(1/2))/(1*2)

r = 1 or r = -1/2

r in { -1/2, 1 }

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