Chapter 3
BASIC ALGEBRAIC EXPRESSIONS
This chapter further develops the preceding chapters’ rigorous discussion
of numbers by introducing a new element, the variable. Variables provide
entirely new avenues of exploration, and the study of algebraic expressions
containing these unknown values immediately supersedes all discussion of
numeric expressions.
Variables aren’t drastically different than numbers. After all,
the entire purpose of a variable is to represent a number, either one
that’s unknown or one that could change values. In this chapter, you
learn how to do many of the same things you were doing in the last two
chapters, but now x’s and y’s will be in the mix. However, this chapter’s
not just a one-trick pony. It has a few other things up its sleeves, like
an investigation of exponents, the order of operations, and scientic
notation.
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