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

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

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

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?

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

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

Simplify. E. F.

Simplify. G. H.

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 10 . The second two terms have the same base, so add the exponents. Simplify the exponent.

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

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

Example 3A: Application The Colorado Department of Education spent about dollars in fiscal year 2004-05 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.

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

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.

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

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?

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

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:

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:

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

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

Example 4E Simplify.

Example 4F Simplify.

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

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

Example 5B: Finding Negative Powers of Quotients Simplify.

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

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

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

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

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.

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.

1. 3. 4. 5. Lesson Quiz: Part I Simplify. 2.

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