Amenable Banach algebras by Pier, Jean-Paul

By Pier, Jean-Paul

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You can do the same operations with variables that you do with numbers, and you need to follow the same rules of arithmetic for variables that you follow for numbers. See Chapter 1 for details on operations and the rules that apply to them. Applying the same operation on both sides of the equal sign When math in real life gives you a mash-up of facts, you can usually make a good equation. But a good equation is just the starting point. You need to solve it, too. To solve an algebra problem, you must perform the same math operations on both sides of the equation.

Notice that through all the different steps, you preserve the equality by doing on one side of the equal sign whatever you did on the other side. Keeping order with operations When equations get complex, you solve them by doing operations in the correct order to simplify them. Not surprisingly, this correct order is called the order of operations (and sometimes it’s known as operator precedence). Here’s the order in which you perform the different operations in an equation, arranged from first to last: 34 Part I: Boning Up on Math Basics ✓ Terms inside parentheses or brackets ✓ Exponents and roots ✓ Multiplication and division ✓ Addition and subtraction The rule of thumb is to work from the “inside out” (starting with terms inside parentheses) and make complex expressions (exponents and roots) simple.

2. Figure out exactly what the problem is asking for. In every word problem, you run the risk of solving — correctly — for the wrong thing. So make sure you know what the question asks for. ” The question could have been about calculating the number of shingles to cover both the shed and the barn, but it’s not. 3. Eliminate excess information. Both real life and school story problems tend to have extraneous facts. Ignore them. For example, the fact that both buildings are red is interesting but not important.

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