1. ## Factorise

Can this be factorised?
4p^2-9q^2

Yes I'm sure it's a p and q, not p and p or q and q

2. Originally Posted by Mukilab
Can this be factorised?
4p^2-9q^2

Yes I'm sure it's a p and q, not p and p or q and q
Yes, use the difference of two squares.

$4p^2 - 9q^2 = (2p)^2 - (3q)^2$

$= (2p - 3q)(2p + 3q)$.