Answer:
2 x 2 x 7
Step-by-step explanation:
if you want to get a number in it's prime factors, you will have to divide the number step by step until it gets to 1. How I got my answer is by writing 28 divide by 2 you will get 14 divide by 2 you will get 7 divide by 7. That how I got 2 x 2 x 7.