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Chapter 6—Expressions and Equations 62 Evaluating Algebraic Expressions
Evaluating Expressions of Addition and Subtraction
Examples:
Examples & Exercises
Evaluating Expressions of Multiplication and Division Algebraic expressions that use multiplication and division look like this: 4a ^{y}/_{4} You can evaluate expressions when you are given exact numerical values for the variables. Examples:
Examples & Exercises
Evaluating Expressions of Addition, Subtraction, Multiplication, and Division The mastery of effective creative thinking doesn't come from memorizing and recalling endless arrays of procedures. It comes from learning how to read the instructions that are encoded in every problem. Many algebraic expressions combine all four basic operations: addition, subtraction, multiplication and division. Here are some examples:
These expressions might look complicated, but you can think of them as sets of instructions. Once you are given a specific value for the variables, these expressions tell you exactly what to do. Consider this example: 4x^{2} + 3x – 2. If we let x = 5, the expression looks like this:
Now the expression is purely numerical. Doing the math:
When x = 5 in the expression, 4x^{2} + 3x – 2, the expression simplifies to 113. Examples:
Examples & Exercises


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