Factorise x2-22-+117

(x - 9) (x - 13)

Step-by-step explanation:

Find the factors of 117

1,117

3,39

9,13

Because 117 is positive, the factors are either both positive or both negative.

Find the pair which sums to - 22. Inorder to get to - 22, the factors must be negative.

-1 + - 117 = - 118

-3 + - 39 = - 42

-9 + - 13 = - 22

The correct factor is - 9,-13. Put it inside the brackets.

(x - 9) (x - 13)