Hello everyoneHere's a little tip: where possible try to factorise an expression if you can, rather than expanding it. You'll usually keep the working much simpler that way.
Now if you don't know thatthen you should learn it. (If you can't see where it comes from, just divide both sides of by .)
Well, that means that:Can you see that this means that we can factorise the original expression? Like this:...(1), using (1)Grandad
, using (1) again.