Evaluating Expressions with Variables

In this video, Mr. J teaches how to find the value of expressions given variable values. The tutorial covers four examples: addition, multiplication and subtraction, exponents, and cubes. Each example demonstrates how to substitute the variable with its given value and solve using order of operations. The video concludes with a summary of the process.

What is the result of 3 + M when M equals 8?

• 15

• 3

• 8

• 11

How do you solve expressions with variables?

• By guessing the variable's value

• By replacing the variable with its given value

• By ignoring the variable

• By multiplying the variable by itself

In the expression 10a - 3, if a equals 2, what operation is performed first?

• Multiplication

• Addition

• Subtraction

• Division

What is the value of 10a - 3 when a is 2?

• 17

• 7

• 13

• 20

What operation is implied when a number is right next to a variable (e.g., 10a)?

• Addition

• Subtraction

• Division

• Multiplication

What does W squared mean in the expression W squared minus 8?

• W * 2

• W + W

• W * W

• 2 / W

If W equals 7, what is the value of W squared minus 8?

• 41

• 49

• 15

• 39

In the expression 6c cubed, if c equals 2, what does 'cubed' mean?

• c + c + c

• c * c * c

• 3 / c

• c * 3

What is the final value of the expression 6c cubed when c is 2?

• 48

• 36

• 12

• 24

What is the correct order of operations in mathematical expressions?

• Addition, multiplication, exponents, subtraction

• Multiplication, addition, subtraction, exponents

• Exponents, multiplication, addition, subtraction

• Exponents, multiplication, subtraction, addition