$$18z^2-24x^2$$
What do you want me to do with this. I cannot simplify for there are no like terms.
Do you want me to factorise?
$$6(3z^2-4x^2)$$
Now that is not very exciting. :))
I suppose that it also equals
$$6(\sqrt3\;z+2x)(\sqrt3\;z-2x)$$
but it is still not very exciting ![]()