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September 20, 2014

September 20, 2014

Posted by **Henry** on Tuesday, October 2, 2012 at 9:16pm.

- Math -
**Steve**, Wednesday, October 3, 2012 at 11:09amx^2 + bx + c = (x-r)^2

2r = -b

r^2 = c

b/c = r^2/(-r/2) = -2r

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