3. if a trinomial to be factored through reverse f. o.i. l. has a negative third term, the last terms of the binomial factors have opposite signs because two numbers with the same sign have a negative product while two numbers with opposite signs have a positive product. a. true b. false

Here's a trinomial with a negative constant and binomial factors with constants with opposite signs:

x^2+x-6=(x+3)(x-2)

We could write that one -(-x-3)(x-2) but that's not really the product of two binomials.

So it's true they have opposite signs, but that's because opposites multiply to a negative, wrong explanation in the answer, let's say false.