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(2x - y) ^7
i meant

Foil it out

or use pascal's triangle

i dont know how to use pascals triangle properly

I dont know what numbers to use for it really.

have you been shown pascal's triangle, this usually happens in algebra 2 or precal

|dw:1357255357277:dw|

yes i've seen the triangle but im unsure which row of numbers im using

we need the 7th row
1 7 21 35 35 21 7 1

|dw:1357255487760:dw|lets go back to one you know (x+y)^2

|dw:1357255543811:dw|do you see the pattern?

i see

|dw:1357255613641:dw||dw:1357255598900:dw|

notice what is happening to x
x^2, x^1, x^0
notice what is happenting to y
y^0, y^1, y^2

we will use the same patter for your problem

so the power of x goes down while the power of y goes up?

yes

|dw:1357255801781:dw|

|dw:1357255969026:dw|

|dw:1357256006811:dw|ok just simplify it now