Evaluate an Expression Given Values of Variables

What is an algebraic expression?

• a letter or a symbol used to represent an unknown value

• an expression that contains numbers, operations, and one or more variables

• a specific number whose values does not change

Evaluate the expression when x =2:

3x + 8

• 13

• 14

• 15

• 16

Evaluate the expression when x = 8:

2x + x - 10

• 34

• 22

• 14

• 24

Evaluate the expression when x = 3. 
2x² - 5

• 31
• 12
• 7
• 13

Evaluate the expression when g = 3 and h = 9:

4h + 2g + 4

• 42

• 46

• 34

• 58

Evaluate the expression when a = 3, b = 4, and c = -6:

bc + 5a

• 9

• 38

• -38

• -9

Evaluate the expression when x = -1 and y = 3:

x² + y² + x - y

• 6

• 8

• 12

• 16

Evaluate the expression when a = 4 and b = -2:

a² - b²

• 4

• 20

• -4

• 12

Evaluate the expression when a = -15:

|a - 5| + 2

• 22

• 27

• -18

• 7

Evaluate the expression when p = 9 and q = 2:

|10p - 7q|

• 31

• 76

• -76

• 152