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posted by WINSTON on Wednesday, March 19, 2014 at 12:21am.

sub 780 for x -2,5x^2 +2825x -115,812.5

-2,5*780^2 + 2825*780 - 115,812.5 Is there a typo in -2,5? Evidently you use a period for the decimal point later on.

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