SOLUTION: (x+y)^7 How do you work this problem?

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Question 213890: (x+y)^7
How do you work this problem?
Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!




where



For your case,



and runs from 0 to 7, so the coefficient of the first term of your expansion is:

(remember 0! = 1)

The rest of the term is



Therefore your entire 1st term is:

Now let's work on the 2nd term, coefficient first:



Then the variables:



Entire 2nd term:

Third term:





Hence,

Just follow the pattern to do the rest of the terms and show your answer as the sum of all the terms.

John