Bell Ringer

O Evaluate the following expression for s = 2

and t = 5.

3𝑠(3)

11 − 5(𝑡)

2

Section 1-2: Order of Operations and

Evaluating ExpressionsPearson Algebra I

I am learning to…

O Simplify expressions involving exponents.

O Use the order of operations to evaluate

expressions.

Vocabulary Section 1-2

O Power: has two parts a base and an

exponent.

O Exponent: tells you how many times to

multiply the base.

O Base: large number in a power.

O Simplify: a numerical expression when you

replace it with its single numerical value.

Example 1: Simplifying Powers

O 34

O2

3

3

O (0.5)3

Key Concept: Order of Operations

O Parentheses

O Exponents

O Multiplication

O Division

O Addition

O Subtraction

Example 2: Simplifying a Numerical Expression

O 5 ∙ 7 − 42 ÷ 2

O 12 − 25 ÷ 5

O4+34

7−2

Example 3: evaluating Algebraic Expressions

O What is the value of each expression when a

= 3 and b = 4.

a) 3𝑏 − 𝑎2

b) 2𝑏2 − 7𝑎

Formative Assessments

O Homework: page 13 #’s 10-34 even