# math

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

• math -

-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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sub 789 for x -2.5x^2 +2825x-115,812.5
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