chapter 7 section 4 rational exponents. a rational exponent is another way to write a radical...
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Simplify each expression.TRANSCRIPT
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Chapter 7
Section 4Rational Exponents
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A rational exponent is another way to write a radical expression.
Like the radical form, the exponent form always indicates the principal root.
414
313
21
1616
2727
2525
FormExponent Form Radical
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Simplify each expression.
31
31
21
21
31
10010 c)
55 b)
125 a)
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If the numerator is not 1:
32 323
252525
:
Example
aaamnn mn
m
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If the exponent is negative• Remember to put the base in the
denominator if it is not there already (or move it to the numerator if it is in the denominator)
33
3 5
35
99
:1
44
5 5
Example
xx
xxyy
c cdd
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Write in radical form
35
-2.5
A) x
B) y
3- 8
.4
C) y
D) z
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Write in exponential form
3
5 2
A)
B) b
a 3 2
3
C)
1D) y
x
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Properties of Exponentsp. 381 (a nice chart)
When Multiplying like bases…add exponentsWhen Dividing like bases …subtract exponentsWhen taking a power to a power… multiply exponentsEverything in parenthesis gets the exponent
m n m na a a
nm m na a
or m m
n n nm
a aam a mb b
mm n
n
a aa
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Simplest form always has only positive exponents
3
5
3.5
-32
Examples:
A) -32
B) 4
C) 25