Warm-upSession 17

Simplify each expression completely.

83

92

34

336

x.4

48 .3

45 .2

.1

xx

aab

xx

yx

918 yx7000,40 x

211256 ba12x

Daily Quiz

Write each expression as a single power of the

base.1. 73 76

2. (y4)3

Simplify each expression.3. (2y)4

4. (3b3)2 b

Turn this in.

Take out your homework.

7.2 Zero & Negative Exponents

Use your calculator to evaluate.

1. 50

2. (-2)0

3. (.45)0

4. (1/7)0

5. (1239)0

6. 00

What can you

conclude?A nonzero number to the zero

power equals one.

Negative exponents

move terms to the other part of the fraction.

Negative exponents move terms to the other part of the fraction. (reciprocal)

Example 1: Evaluate

x

y24

x

y24

4 is downstairs.We will move it…

x

y16

Example 2

4

3

x

1

3 4x 43x

x is downstairs.We will move it…

Example 3

29

29

1

81

1-9 is upstairs.

We will move it…

Now let’s include what we learned from last class.

33 44 334 04 1

423 83 6561

What do we know that we can do with these exponents?

What do we know that we can do with these exponents?

225 210 2)10(

1

100

1

Evaluate the expression without using a calculator.

2

21

32

43 .6

3 .5

44 .4

-

4

1

9

144

1

Rewrite the expression with positive exponents.

3

2

33

5 .9

3 .8

2 .7

b

x

yx3

32

x

y

23x

3125

1

b

Class work:SPW 65What do you call it when a plane comes down in a garbage heap?

• Turn this in on the cart when you are finished

• Make sure your name is on it

Work

p. 452 21 – 39 by 3s

and 51 – 62 all