Question

I don't understand how to find the product of (x-3y)(2x+3y)

Answer 1

Hey, okay, so you just FOIL it.
F - first, O - outside, I - inside, L - last.
multiply x&2x, x&3y, -3y&2x, -3y&3y.
So it should look like this:

2x^2+3xy-6xy-9y
so the final answer should be
2x^2+3xy-9y