Evaluating Algebraic Expressions

This video tutorial teaches how to evaluate one-step algebraic expressions by substituting a given number for the variable. It covers common mistakes, such as forgetting to substitute the variable, and provides examples with different operations: subtraction, addition, division, and multiplication. The lesson concludes with advanced examples, reinforcing the concept of substitution in algebraic expressions.

What is the first step in evaluating a one-step algebraic expression?

• Adding a constant to the variable

• Substituting a given number for the variable

• Dividing the variable by itself

• Multiplying the variable by zero

Which of the following is a common mistake when working with algebraic expressions?

• Using the wrong operation

• Forgetting to substitute the variable

• Multiplying instead of dividing

• Adding instead of subtracting

What is the result of 9 minus x when x equals 3?

• 12

• 6

• 3

• 9

How do you express multiplication in algebraic expressions?

• Using a division sign

• Using a subtraction sign

• Placing a number and variable next to each other

• Using a plus sign

What is the value of 9 divided by x when x equals 3?

• 9

• 1

• 3

• 6

What is the result of 9 times x when x equals 3?

• 3

• 9

• 27

• 18

What is the value of 15 times x when x equals 3?

• 75

• 30

• 45

• 60

If x equals 4, what is the result of 15 times x?

• 75

• 45

• 60

• 90

What is the outcome of 15 times x when x equals 10?

• 100

• 120

• 180

• 150

What is the key takeaway from this lesson on evaluating expressions?

• Always add the variable

• Substitute the variable with a given number

• Ignore the variable

• Multiply the variable by zero