3r^2-8r-28=0
Solve with quadratic formula
2 answers:
R = 8 +- sqrt(64-4*3*-28) / 6
r = 8 +- sqrt(64--336) / 6
r = 8 +- sqrt(400) / 6
r = (8 +- 20) / 6
r = 14/3 or -2
(8 plus of minus radical 64 + 216
divided by
6
(8 + or - 16.73320053)/6
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