Click here to load reader
Upload
algebra-mathematics
View
446
Download
1
Embed Size (px)
Citation preview
Section 1.2
Order of Operation
Variable
• A Variable is a symbol, usually a letter, used to represent a number
4 x n a + 7b
5 + r 3x – 4 * t
t – 2 y – 3 + r
Numerical Expression
• Numerical Expression contains numbers and at least one operation.
Examples:3 + 2 17 * 3
20 / 4
14 – 8 21 - 5 + 21000 / 8 + 123
Algebraic Expression
• An Algebraic Expression contains variables, numbers and at least one operation symbol.
4 x n a + 7b
5 + r 3x – 4 * t
t – 2 y – 3 + r
Which of the following is NOT an Algebraic Expression?
Evaluate an Expression
• To Evaluate an expression means to ‘solve’ the expression.
For example:
Evaluate the following numerical expressions:
1. 3 + 4 2. 12 / 23. 7*6
Evaluate the following algebraic expressions, if a=2 b=5 c=8:
1. a + 13 2. 19 – b3. a * c
1. 2 + 13 2. 19 – 5 3. 2 * 8
• If an expression has more than one operation you must use:
ORDER OF OPERATION
ORDER OF OPERATION
• 1. Evaluate expressions inside grouping symbols. (Parentheses)
• 2. Evaluate all powers. (Exponents)• 3. Do all multiplications and/or divisions from
left to right. (Multiplication and Division)• 4. Do all additions and/or subtractions from
left to right. (Addition and Subtraction)
Please Excuse My Dear Aunt Sally
• Classwork:
• Page 13 # 4 – 12 EVEN
Homework:
Page 14 # 24 - 34