Evaluating Expressions with Variables

This video tutorial teaches how to evaluate multiple-step algebraic expressions by substituting numbers for variables. It emphasizes the importance of following the order of operations (PEMDAS) and demonstrates the process through various examples. The tutorial covers substituting a single value into multiple expressions and substituting different values into a single expression, providing a comprehensive understanding of evaluating algebraic expressions.

What is the first step in the order of operations?

• Parentheses

• Addition and Subtraction

• Multiplication and Division

• Exponents

When evaluating 15x + (8 - x) for x = 3, what is the result of the expression inside the parentheses?

• 3

• 15

• 5

• 8

After substituting x = 3 in 15x + (8 - x), what is the result of 15 times 3?

• 60

• 45

• 30

• 50

What is the final value of 15x + (8 - x) when x = 3?

• 60

• 55

• 50

• 45

For the expression 9 - 3x, what is the result when x = 3?

• 3

• 0

• 9

• 6

What is the value of 9 + 3x when x = 3?

• 18

• 12

• 9

• 21

How do you evaluate 9 / (3x) when x = 3?

• 0

• 1

• 9

• 3

What is the result of 9x + 3 when x = 3?

• 27

• 36

• 33

• 30

What is the result of 50 - 5x when x = 4?

• 25

• 30

• 20

• 35

For the expression 50 - 5x, what is the result when x = 10?

• 30

• 20

• 10

• 0