Posted by David on Thursday, December 13, 2012 at 12:30pm.
typo in the first ...
in 2nd:
x^2 + 2x - 82 = 0
x = (-2 ± √(4 -4(1)(-82))/2
= (-2 ± √332)/2
= (-2 ± 2√83)/2
= -1 ± √83
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