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I know about Pascal's triangle, but I don't know if that's what you're referring to.

Sure, do need an explanation of what it is, or do you have a problem you want me to look at?

you*

http://mathworld.wolfram.com/PascalsTheorem.html

Sure, do you know how to expand a binomial (something)^2?

Make sense?

pascal's triangle is use to expand

|dw:1358369183479:dw|

|dw:1358369198853:dw|do you see the pattern?

|dw:1358369366989:dw|

|dw:1358369387693:dw|then notice what is happening to the x powers and then the y powers

x powers start at 2 while y start at 0

this is the pattern you will follow for you problem

Now, if we wanted to take that further like (x +y)^3 (like your problem) we can do two things.

|dw:1358369548166:dw|you will use the 3rd row

|dw:1358369588020:dw|

That would give us the correct answer, OR we could use the pattern precal is showing us.

|dw:1358369600649:dw|

be careful with your second term because of the negative, just simplify and you are done

yw