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 Post subject: FactorisingPosted: Tue, 14 Sep 2010 09:05:30 UTC
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Joined: Tue, 14 Sep 2010 09:02:34 UTC
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Can Somebody explain to me how you would solve the following question, thank you.

Factorise fully the following expression:
x3 +y3 + 3x + 3y

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 Post subject: Re: FactorisingPosted: Tue, 14 Sep 2010 09:39:36 UTC
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GerCoffey wrote:
Can Somebody explain to me how you would solve the following question, thank you.

Factorise fully the following expression:
x3 +y3 + 3x + 3y

, etc. so .

Or do you mean x^3=, etc.? If so, you cannot factorise in any meaningful way.

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 Post subject: Posted: Tue, 14 Sep 2010 10:12:07 UTC
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Joined: Tue, 14 Sep 2010 09:02:34 UTC
Posts: 3
Thanks for the response, sorry for not being clear, the first two are cubes so it reads

x^3 + y^3 + 3x + 3y

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 Post subject: Posted: Tue, 14 Sep 2010 13:52:52 UTC
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Joined: Mon, 19 May 2003 19:55:19 UTC
Posts: 7949
Location: Lexington, MA
Hello, GerCoffey!

Quote:
Factor: .

Note that the first two terms is a "sum of cubes".
And you should know that: .

So we have: .

Factor out the common

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 Post subject: Posted: Tue, 14 Sep 2010 14:21:09 UTC
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Joined: Tue, 14 Sep 2010 09:02:34 UTC
Posts: 3
Thank you, one of those ones that now I know is so easy but couldnt for the life of me see it. such a relief.

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