Evaluating an Algebraic Expression

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

a² - b²

• 4

• 20

• -4

• 12

Evaluate 2a + 4b 
if a = 10     and    b = 6

• 20

• 24

• 44

• 4

Evaluate 4y

y = 3

• 7

• 12

How many terms are in the expression
3x + 2y + z

• 5

• 2

• 4

• 3

Identify the variable(s) in the expression 3x +  9

• x

• y

• 9

• 3x

How many terms are in the expression
3a + 2b + c + 100

• 3

• 4

• 5

• 6

Write an algebraic expression for "12 more than number". 

• x + 12

• 12x

• x - 12

Write an algebraic expression for "8 less than a number".          

• 8x

• x - 8

• 8 - x

Evaluate 2r + 1

r = 3

• 24

• 5

• 7

• 8

Evaluate m²

m = 7

• 9

• 14

• 49

• 51