I don't know the quadreatic formula for this
posted by David .
X^2 x+2=82, x^2+2x=82

I don't know the quadreatic formula for this 
Reiny
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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