The diagram represents the factorization of x2 – 9x + 18. It is partially completed.

The correct answers are:
-3x and -6x.
Explanation:
In this model, we multiply the top terms by the terms on the right. For the box in the top right, we multiply x(x) which gives us x².
For the two missing boxes, we have -3(x) which gives us -3x and -6(x) which gives us -6x.