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write in standard form 5r^2 - 2r -1 = 0
Then a = 5, b =-2, c = -1
The quadratic formula is [-b +/- squareroot(b^2 -4ac)]/(2a)
Replacing a, b, c:
(2 +/- squareroot(4+20))/10
=2/10 +/- squareroot(24)/10
=1/5 +/- squareroot(6)/5
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