Question

How to Expand (x + 2y)^5

Answer 1

(x+2y)(x+2y)(x+2y)(x+2y)(x+2y)

Answer 2

^that is probably the ugliest way to do it
I would use either Pascal's triangle or the binomial theorem

Answer 3

it take a long time if you do it that way. true

Answer 4

i like to show the long way so it becomes more clear. Pascal's triangle is goog way to do it. or a calculator!!

Answer 5

binomial theorem:\[(a+b)^n=\sum_{k=0}^n\binom nka^{n-k}b^k\]where\[\binom nk={n!\over k!(n-k)!}\]

Answer 6

if the binomial theorem looks like Greek to you then I would go with Pascal's triangle since it is only to the 5th power

Answer 7

thank you :)

Answer 8

welcome!

Answer 9

nice