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### Conclusion

In this chapter, you began with an exploration of basic factoring. A review of factoring at this point is worthwhile because it anticipates work to come in the next chapter and also serves as an occasion for reviewing the basic properties of numbers. In this respect, it also proves worthwhile to briefly review the order of operations as you solve problems. Given this start, the discussion then turned to an extension of the previous explorations of sets. In this context, the focus of attention lay on showing that you can define relations between numbers by using sets.

A central notion in this respect is that of the domain and range of an ordered pair of numbers. Given a relation that generates ordered pairs, you can identify the first ...

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