# Expand (z-1)^5

I simply have to expand (z+1)^5

I think I have the solution Im just unsure about the signs:

z^5 5z^4 10z^3 10z^2 5z^1 1

Is it alternate signs + - + - .....

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lanedance
Homework Helper
I think you meant (z-1)^5

but your signs sound correct, consider how many times each must be multiplied by (-1), eg the z term must be multiplied by (-1)^4 so is even

Ye sorry I did mean (z-1)^5, if it was (z+1)^5 would that be the same expansion exceot the signs be all positive. Thanks