Question

Select the two binomials that are factors of this trinomial x^20 - x - 20

Answer 1

`(x-5)(x+4)`

Explanation:

To factor the equation, break it into two binomials which multiply to make the equation. To write these binomials (x+a)(x+b), find factors which multiply to -20 and add to -1 for a and b.

20: 1, 2, 4, 5, 10, 20

-5+4 = -1

`x^2-x-20 = (x-5)(x+4)`