SOLUTION: r squared - 8r = 2

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Question 142666: r squared - 8r = 2
Answer by checkley77(12844) About Me  (Show Source):
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R62-8R=2
R^2-8R-2=0
r+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+
r=(8+-sqrt[-8^2-4*1*-2])/2*1
r=(8+-sqrt[64+8])/2
r=(8+-sqrt72)/2
r=(8+-8.4853)/2
r=(8+8.4853)/2
r=16.4853/2
r=8.243 answer.
r=(8-8.4853)/2
r=-.4853/2
r=-.24265 answer.