Factor each polynomial. If the polynomial is prime, say so. Four terms means start with grouping

x2(x 2) 9(x 2) The common factor for each group is (x 2)

(x 2)(x2 9) Notice the difference of squares in second group

(x 2)(x 3)(x -+ 3) Now it is completely factored. This is one of the ways to work this answer out.

1.m²+21m+20