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# Algebra Proof Watch

1. Hi,

I've been reading through the CGP GCSE book after a long spell out from mathematics and I've covered numbers and algebra so far. It's been going well but I am struggling to understand this particular proof example.

(n+3)²- (n-2)² n² + 6n + 9 - (n² -4n + 4).

Where do 6n and 4n come from?

2. AlgeBRUH

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3. (Original post by Wdolidol19)
Hi,

I've been reading through the CGP GCSE book after a long spell out from mathematics and I've covered numbers and algebra so far. It's been going well but I am struggling to understand this particular proof example.

(n+3)²- (n-2)² n² + 6n + 9 - (n² -4n + 4).

Where do 6n and 4n come from?

They come from multiplying 2 brackets together

What do you think you get from (x+3)(x+3)
4. You don't square each term individually. Look at it as (n+3)(n+3) - (n-2)(n-2).
5. (Original post by Wdolidol19)
Hi,

I've been reading through the CGP GCSE book after a long spell out from mathematics and I've covered numbers and algebra so far. It's been going well but I am struggling to understand this particular proof example.

(n+3)²- (n-2)² n² + 6n + 9 - (n² -4n + 4).

Where do 6n and 4n come from?

It basically means to expand the brackets out so, it would look like this (n+3)(n+3) multiply them and the same goes to the second bracket

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Updated: January 13, 2015
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