1. Chapter 4-2 Power and Exponents
UNIT 2
Chapter 4-2 Power and Exponents

2. The power is the number that can expressed as an exponent
An expression like 2 x 2 x 2 x 2 can be written as a power.
A Power has 2 parts, a Base and an Exponent
An Exponent shows repeated multiplication
The base is the number 4² The exponent tells how many times
that is multiplied the base is used as a factor
The power is the number that can expressed as an exponent

3. Exponents How to write and read powers with a positive exponent.
2 ¹ to the first power = 2
2 ² 2 to the second power or 2 squared = 2 • 2
2 ³ 2 to the third power or 2 cubed = 2 • 2 • 2
2 ⁴ 2 to the fourth power or 2 to the fourth = 2 • 2 • 2 • 2
****Any number raised to the 0 power equals 1!
6 0 = = 1

4. Write Each Expression Using Exponents
B) (-8) (-8) = (-8) ²
C) 7 • X • X• X• Y•Y = 7x³ y²

5. Evaluate Each Expression
Since powers are a form of multiplication, they need to be included in the rules for order of operation.
Remember…Orders of Operation:
Parenthesis ( )
Exponents
Multiply or Divide left to right
Add or Subtract left to right

6. Evaluate Each Expression
A) 2 ³ = 2 • 2 • 2 = 8 B) Y ² + 7 if y = 3 (3)² + 7 Replace y with 3 (9) + 7 Simplify the exponent and Add = 16

7. Let’s Try Some Examples
Write each expression using exponents 1)4 • 4 • 4 • 4 • 4 2) 6 3) (-5)(-5)(-5) Evaluate each expression 4) Z² if z = 9 5) X ² • 2², X = 3

8. Let’s Check Our Answers
Write each expression using exponents 1)4 • 4 • 4 • 4 • 4 = 4 4 2) 6 = 6 1 3) (-5)(-5)(-5) = (−5) 3 Evaluate each expression 4) Z² if z = 9 5) X ² • 2², if X=3 (9)² = 81 (3)² • • 4 = 36