Answer
$(3-a)$ and $(b+c)$
Work Step by Step
We know that a product is composed of more than one number and/or variable being multiplied together. The factors of a product are the parts being multiplied together.
Therefore, the factors of $(3-a)(b+c)$, which is equal to $(3-a)\times(b+c)$, are $(3-a)$ and $(b+c)$.