This document describes factorizing the quadratic expression x^2 + 1x - 20. It shows the steps of multiplying, finding the factors of -20, and determining that the expression can be fully factorized as (x - 4)(x + 5).

1. x2 + 1x - 20

2. 1x2 + 1x - 20
Multiply
-20

3. 1x2 + 1x - 20
-20
Factor
1 20
2 10
4 5

4. 1x2 + 1x - 20
Factors must combine to this
-20
Factor
1 20
2 10
4 5

5. 1x2 + 1x - 20
Sign of larger #
-20
Factor
1 20
2 10
-4 +5

6. 1x2 + 1x - 20
(x )(x )
-20
Factor
-4 +5

7. 1x2 + 1x - 20
(x )(x )- 4 + 5