# Math Help - Basic Factorisation

1. ## Basic Factorisation

Sorry if this is too easy but I seem to have a bit of a block!

I have to Factorise 4*(a*b) - 2*(a*c)

I had a shot at it which gave me:
take out 2a. ...

2a*(8b-2c) hence

(2a-8b)(2a-2c)

this just looks wrong - any help is welcome.

2. Originally Posted by Katie McMeeking
Sorry if this is too easy but I seem to have a bit of a block!

I have to Factorise 4*(a*b) - 2*(a*c)

I had a shot at it which gave me:
take out 2a. ...
OK, this gives:

$
4(a\ b) - 2(a\ c) = 2a(2b-c)
$

and that is all you can do.

RonL

3. Thankyou - life saver! I knew it should be simple. ...