2. Transparency 8 Click the mouse button or press the Space Bar to display the answers.

3. Splash Screen

4. Example 8-4b Objective Use powers and exponents in expressions

5. Example 8-4b Vocabulary Base The number that is multiplied (the factor) 3 5 Three is the base

6. Example 8-4b Vocabulary Exponent Tells how many times the base is used as a factor 3 5 Five is the exponent

7. Example 8-4b Vocabulary Power The number that is expressed using an exponent 3 5 Five is showing the “power of 5”

8. Example 8-4b Review Vocabulary Squared When the exponent is two 3 2 Three squared

9. Example 8-4b Vocabulary Cubed When the exponent is 33 Three cubed

10. Lesson 8 Contents Example 1Write an Expression Using Powers Example 2Evaluate Powers Example 3Evaluate Powers Example 4Evaluate Powers

11. Example 8-1a Answer: p 4 q 3 Write using exponents. Write the first letter p Count number of p’s listed 4 This will be the exponent to the letter p q 3 1/4 Write the next letter not used Count number of q’s listed This will be the exponent to the letter q

12. Example 8-1b Answer: x 3 y 4 Write using exponents. 1/4

13. Example 8-2a Answer: Evaluate. Write problem 9595 Use calculator Push the = sign 2/4 Put in base which is 9 9 Push the [y x ] key Put in exponent which is 5 [y x ] 5 = 59,049

14. Example 8-2b Answer: 7,776 Evaluate. 2/4

15. Example 8-3a Evaluate Write problem 3 -7 The negative exponent means to reciprocate and change exponent to positive 1 3737 Remember: Reciprocate means to put the numerator in the denominator and the numerator Do not write as decimal 3/4 Put 1 in the numerator and draw fraction bar Put the 3 7 in the denominator and remove the negative

16. Example 8-3a Answer: Evaluate 3 -7 1 3737 3/4 Bring down the 1 in numerator and fraction bar Find 3 7

17. Example 8-3b Answer: Evaluate 3/4

18. Example 8-4a Answer: 2,048 ALGEBRA Evaluate if and Write problem x 3 · y 5 Replace x with 4 4 3 · 2 5 Find 4 3 64 · 32 Find 2 5 2,048 4/4 Replace y with 2 Multiply

19. Example 8-4b Answer: 2,304 ALGEBRA Evaluate if andALGEBRA Evaluate * 4/4

20. End of Lesson 8 Assignment Lesson 2:8Powers & Exponents15 - 41 All