math
posted by WINSTON .
sub 780 for x
2,5x^2 +2825x 115,812.5

math 
Steve
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 +2825x115,812.5 
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sub 789 for x 2.5x^2 +2825x115,812.5 having troubble undeerstanding the process . could someone show me step by step..