1. ## expansion

how would you expand (a^x+b)^y?
sorry if this is in wrong place but i wasnt sure where to put it.
thanks for any help.

2. Originally Posted by hmmmm
how would you expand (a^x+b)^y?
sorry if this is in wrong place but i wasnt sure where to put it.
thanks for any help.
look up binomial expansion

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

3. ## thanks

thanks very much but what happens if the x has a power that isnt 1?

4. Originally Posted by hmmmm
thanks very much but what happens if the x has a power that isnt 1?
say we write x as $a^x$ in the above formula:

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