SOLUTION: what are the last three terms of (a-b)^7 ??

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Question 93613This question is from textbook
: what are the last three terms of (a-b)^7 ?? This question is from textbook

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
what are the last three terms of (a-b)^7 ??
6th term: 7C2a^2(-b)^5 = -21a^2b^5
7th term: 7C1a^1(-b)^6 = 7ab^6
8th term: 7C0a^0(-b)^7 = -b^7
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Cheers,
Stan H.