Question

How does the expansion of (x + y)n and (x - y)n differ? If you can offer an example that would be very helpful.

Thank you

Answer 1

think about it. (x+y)^n has + signs for all the terms.

(x-y)^n has minus signs for all the odd powers of n, since that is the same as

(x + (-y))^n

I'm sure you can provide your own examples. You might also try this web site:

http://www.wolframalpha.com/input/?i=(x-y)%5E5

Just scroll down past the graphs.