1. Division Properties of Exponents
7-4
Division Properties of Exponents
Warm Up
Lesson Presentation
Lesson Quiz
Holt Algebra 1

2. Write in Scientific Notation.
Warm Up
Simplify.
1. (x2)3 3. 5. x6 2. 4. 6.
Write in Scientific Notation. 7. 8.

3. Objective
Use division properties of exponents to evaluate and simplify expressions.

4. A quotient of powers with the same base can be found by writing the powers in a factored form and dividing out common factors. 35 33 =
3· 3· 3· 3· 3
3· 3· 3 =
3· 3 = 32 67 62 =
6· 6· 6· 6· 6· 6· 6
6· 6 =
6·6·6·6 = 64
Is there a relationship between the exponents in the original quotient and the exponent in the final power?

6. Example 1: Finding Quotients of Powers
Simplify. A. B.

7. Example 1: Finding Quotients of Powers
Simplify. C. D.

8. Simplify. E. F.

9. Simplify. G. H.

10. Example 2A: Dividing Numbers in Scientific Notation
Simplify and write the answer in scientific notation
Write as a product of quotients.
Simplify each quotient.
Simplify the exponent.
Write 0.5 in scientific notation as 5 x
The second two terms have the same base, so add the exponents.
Simplify the exponent.

11. You can “split up” a quotient of products into a product of quotients:
Example:
Writing Math

12. Example 2B
Simplify and write the answer in scientific notation.
Write as a product of quotients.
Simplify each quotient.
Simplify the exponent.

13. Example 3A: Application
The Colorado Department of Education spent about dollars in fiscal year on public schools. There were about students enrolled in public school. What was the average spending per student? Write your answer in standard form.
To find the average spending per student, divide the total debt by the number of students.
Write as a product of quotients.

14. Example 3 Continued
Simplify each quotient.
Simplify the exponent.
Write in standard form.
The average spending per student is $5,800.

15. Example 3B
In 1990, the United States public debt was about dollars. The population of the United States was about people. What was the average debt per person? Write your answer in standard form.
To find the average debt per person, divide the total debt by the number of people.
Write as a product of quotients.

16. Simplify each quotient.
Simplify the exponent.
Write in standard form.
The average debt per person was $12,800.

17. A power of a quotient can be found by first writing the numerator and denominator as powers.
Is there a relationship between the exponents in the original expression and the exponent in the final answer?

19. Example 4A: Finding Positive Powers of Quotients
Simplify.
Use the Power of a Quotient Property.
Simplify.

20. Example 4B: Finding Positive Powers of Quotient
Simplify.
Use the Power of a Product Property.
Use the Power of a Product Property:
Simplify and use the Power of a Power Property:

21. Example 4C: Finding Positive Powers of Quotient
Simplify.
Use the Power of a Product Property.
Use the Power of a Product Property:
Use the Power of a Product Property:

22. Example 4C Continued
Simplify.
Use the Power of a Product Property:

23. Example 4D
Simplify.
Use the Power of a Quotient Property.
Simplify.

24. Example 4E
Simplify.

25. Example 4F
Simplify.

26. Remember that What if x is a fraction?.
Therefore,

28. Example 5A: Finding Negative Powers of Quotients
Simplify.
Rewrite with a positive exponent.
Use the Powers of a Quotient Property .
and

29. Example 5B: Finding Negative Powers of Quotients
Simplify.

30. Example 5C: Finding Negative Powers of Quotients
Simplify.
Rewrite each fraction with a positive exponent.
Use the Power of a Quotient Property.
Use the Power of a Product Property:
(3)2x (2n)3 = 32 x 23n3
and (2)2 x (6m)3 = 22 x 63m3

31. Example 5C: Finding Negative Powers of Quotients
Simplify.
Square and cube terms. 1 24 2 12
Divide out common factors.
Simplify.

32. Whenever all of the factors in the numerator or the denominator divide out, replace them with 1.
Helpful Hint

33. Example 5D
Simplify.
Rewrite with a positive exponent.
Use the power of a Quotient Property.
93=729 and 43 = 64.

34. Example 5E
Simplify.
Rewrite with a positive exponent.
Use the Power of a Quotient Property.
Use the Power of a Power Property: (b2c3)4= b2•4c3•4 = b8c12 and (2a)4= 24a4= 16a4.

35. Example 5F
Simplify.
Rewrite each fraction with a positive exponent.
Use the Power of a Quotient Property.
Use the Power of a Product Property: (3)2= 9.
Add exponents and divide out common terms.

36. 1. 5.
Lesson Quiz: Part I
Simplify. 2.

37. Lesson Quiz: Part II
Simplify.
6. Simplify (3 x 1012) ÷ (5 x 105) and write the answer in scientific notation.
6 x106
7. The Republic of Botswana has an area of 6 x 105 square kilometers. Its population is about 1.62 x 106. What is the population density of Botswana? Write your answer in standard form.
2.7 people/km2