Asked by WINSTON

sub 789 for x
-2.5x^2 +2825x-115,812.5
having troubble undeerstanding the process . could someone show me step by step..
Answered by Steve
first step, as I have shown you on two of these, is <b>do the substitution</b>. Wherever there is an x, replace it with 789:

-2.5(789^2) + 2825(789) - 115812.5

Now just pull out your handy calculator, or use an online calculator, and discover that the value is

556810
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