What binomial is a factor of this trinomial x2- 13x plus 30?

Answer 1

x2 - 13x + 30 = (x - 3)(x - 10).

In case you are provided with a list that you forgot to include with your question, then any of the following is a possible factor:

x - 3; x - 10; 3 - x; or 10 - x.

Answer 2

If that's -13x, the answer is (x - 10)(x - 3)

If that's +13x, the answer is (x + 10)(x + 3)

Answer 3

(x - 10)(x - 3)