# How to factorise z^4 - 1?

## Answer

umm its a difference of squares, so z^4 - 1 = (z^2 - 1)z^2 +1) = (z-1)z+1)z^2 + 1) I'm not too sure if that's what you were looking for, but I tried :
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 throw away your textbook if it has so many errors. firstly, what is written is not a GP. for that it needs to be 1 + z + z^2 + z^3 + z^4 + z^5, with a = 1, r = z and the ans should http://uk.answers.yahoo.com/question/index?qid=201...
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