80-120p+45p2 (45p is squared)

That is an expression, what do you want to do with it?

I'm trying to figure trinomials

If you are trying to factorize the expression, I'll give you the first step:

80-120p+45p2 (45p is squared)
=5(9p²-24p+16)
= ...

Did you get it factorized?

5(3p-4)(3p-4)