Algebra 1 Evaluating Algebraic Expressions

What is a variable?

• A letter or symbol standing for an unknown value

• Just another confusing algebra thing

• Nothing useful

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

• 20

• 24

• 44

• 4

Evaluate when a = 15:
2(a - 5) + 2

• 22

• 27

• 14

• 7

Evaluate the expression.   Let g = 3    h = 9 
4h + 2g + 4

• 42

• 46

• 34

• 58

evaluate bc + 5a  
when  a = 3, b = 4, and c = -6

• 9

• 38

• -38

• -9

Evaluate the expression

• -19

• -1

• -31

• 3

Evaluate the expression

• -12

• 20

• 0

• 5

• 61

• 54

• 43

• 32

Which is the variable below?

• 19

• x

• 19 and x

• 17

b² + 4
when b = 3

• 10

• 12

• 13

• 11