# a2-b2 type expressions

**3. type expressions**

is product of (a-b)(a+b) factors. To factorize such type expressions, we convert a given expression into form and then factorize it by writing it in (a-b)(a+b) form. See example below;

**Example: Factorize **

Solution:

To factorize this expression we first apply type 1 technique i-e take out anything common. Here 6 is common – which we take out;

i-e

Then we convert expression inside brackets to form;

i-e

And then factorize it in (a-b)(a+b) form;

Again we can see that can be converted to (a-b)(a+b) form – so above expression will become;

Again apply (a-b)(a+b) form here;