# Binomial expansion and pascal's triangle

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• September 24th 2012, 03:00 PM
ubhutto
Binomial expansion and pascal's triangle
How many terms are in the expansion of (x + y)^n ( i think its n + 1 but i'm not sure if its right)

How do the expansion of (x + y)^n differ from (x - y) ^ n ? [can you explain the steps of how you got the answer]

thanks alot
• September 24th 2012, 03:10 PM
MarkFL
Re: Binomial expansion and pascal's triangle
The binomial theorem says:

$(x+y)^n=\sum_{k=0}^n{n \choose k}x^{n-k}y^k$

Using this, can you explain how to answer the questions with certainty?