### Home > PC > Chapter 1 > Lesson 1.4.1 > Problem 1-139

1-139.

Factor out common terms or expressions.

(*a* − 3) is common to both terms.

So: (*a* − 3)((*a* − 3) − 1) = (*a* − 3)(*a* − 4)

Follow the same procedure as (a).

1-139.

Factor out common terms or expressions.

(*a* − 3) is common to both terms.

So: (*a* − 3)((*a* − 3) − 1) = (*a* − 3)(*a* − 4)

Follow the same procedure as (a).