Macaulay's Method: Solving for B and A

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mariechap89
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Hi.
I have attached the question and my attempt at the answer.
I am not sure if I have the original equation correct and am not sure where to go from the last equation I have shown. Any help would be great.
Thanks.
 

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mariechap89: I have marked corrections on your paper. Can you now solve for B and A? After that, can you solve the problem?
 

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