Re: Factorising this...
- From: Albert <albert.xtheunknown0@xxxxxxxxx>
- Date: Sun, 9 Dec 2007 14:20:13 -0800 (PST)
On Dec 10, 8:41 am, quasi <qu...@xxxxxxxx> wrote:
On Sun, 9 Dec 2007 13:30:21 -0800 (PST), Albert
<albert.xtheunkno...@xxxxxxxxx> wrote:
Hi, I'm in Year 8 (Australia) so this should be an easy question for
you guys seeing what this group is about... but how do you 'fully
factorise' this?
(They've given me the identities: difference of two squares, sum and
difference of two cubes and the perfect square rule but I'm not sure
how you apply them; i can do the individual questions relating to each
one of these indentities, but then again this question is in the
'problems section' [the last question] of this booklet...)
a²b² -a² -b² + 1
Hint:
First try 2 simpler problems:
(1) Factor: uv + u + v + 1
(2) Factor: uv - u - v + 1
quasi
Thanks - I solved my original question:
a²b² - b² -a² + 1 = b²(a² - 1) - (a² - 1)
= (a² - 1)(b² - 1)
.
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