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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
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Daily Quiz
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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.
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7.2 Zero & Negative Exponents
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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.
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Negative exponents
move terms to the other part of the fraction.
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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
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Example 2
4
3
x
1
3 4x 43x
x is downstairs.We will move it…
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Example 3
29
29
1
81
1-9 is upstairs.
We will move it…
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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
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Evaluate the expression without using a calculator.
2
21
32
43 .6
3 .5
44 .4
-
4
1
9
144
1
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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
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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
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Work
p. 452 21 – 39 by 3s
and 51 – 62 all