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How the heck do you expand 2x - y^7?

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(2x - y) ^7 i meant
Foil it out
or use pascal's triangle

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Other answers:

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

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