| 9 | Some “School” Algebra |
In this chapter, you’ll learn some basic techniques that have always been taught in first-year “school” algebra courses. You’ll also learn how to solve sets of equations that have more than one variable.
ORDERLY WRITING IN ALGEBRA
Although parentheses can clarify problems with “long multiplication,” removing the parentheses to perform the multiplication needs understanding, so you can see how algebra is like arithmetic. Your pocket calculator does long multiplication in arithmetic. It’s not easy to get your calculator to do it in algebra.
Figure 9-1 shows four examples of long multiplication in algebra. Each one is a little more complicated than the one above it. At A, you multiply a parenthetical expression by a ...
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