Omar grouped the terms and factored the gcf out of the groups of the polynomial 3x3 – 15x2 – 4x + 20. his work is shown. step 1: (3x3 – 15x2) + (–4x + 20) step 2: 3x2(x – 5) + 4(–x + 5) omar noticed that he does not have a common factor. which accurately describes what omar should do next? a omar should realize that his work shows that the polynomial is prime. b omar should go back and regroup the terms in step 1 as (3x3 – 15x2) – (4x + 20). c in step 2, omar should factor only out of the first expression. d omar should factor out a negative from one of the groups so the binomials will be the same.