working with powers
DESCRIPTION
Working with Powers. Integer Exponents Exponent Rules Order of Operations. 2 × 2 = 2 × 2 × 2 = 2 × 2 × 2 × 2 = How can we write these in shorter notation?. 3 × 3 × 3 × 3 × 3 = . Multiplication is a shortcut for repeated addition. - PowerPoint PPT PresentationTRANSCRIPT
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Working with Powers
• Integer Exponents• Exponent Rules• Order of Operations
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• 2 × 2 =
• 2 × 2 × 2 =
• 2 × 2 × 2 × 2 =
• How can we write these in
shorter notation?
22
32
42
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• Multiplication is a shortcut for repeated addition.
• Exponents are a shortcut for repeated multiplication.
3 + 3 + 3 + 3 + 3 = 5 × 3
3 × 3 × 3 × 3 × 3 = 53
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Write these numbers using exponential notation:
• 10,000 = 10?
• 27 = 3?
• 32 = 2?
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Integer Exponents
• Base 4• Exponent 3
• 43 is called a power
• 43 = 4 x 4 x 4 • = 64
34
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You try these . . .
• 72
• 54
• 210
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Operations with Exponents
• Multiply (x3)∙(x4)= (x ∙ x ∙ x) ∙ (x ∙ x ∙ x ∙ x) = (x ∙ x ∙ x ∙ x ∙ x ∙ x ∙ x) = x7
A5 ∙ A4 =
• Divide: xxxxxxx
3
4
xx
1x
x
3
4
mm
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Exponent Rules
aaa1an ....#1
n times
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Zero as an exponent
• 40
• 90
• 170
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Exponent Rules
1a 0#2
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a0 = 1
• M0
• (pq)0
• (2x2y)0
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Negative Exponents
• 3-1
• 7-1
• 5-2
• 2-4
• (1/2) -1
• (3/4) -2
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Exponent Rules
nn
n aa
a 11#3
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• M-2
• x-5
• (1/y)-3
nn
aa 1
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Combining Exponents
5
32
x
xxxxxxx
aman=?
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Exponent Rules
nmnm aaa #4
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• y-2y7
• m6m-6
• 2z-3z5w-6w-2
• x5x4
• b3b-6
• (2x3)(4x-2)
nmnm aaa
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Combining Exponents
3
2
5
xxxxxxxx
xx
am/an=?
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Exponent Rules
nmn
m
aaa
#5
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nmn
m
aaa
2
6
xx
7
2
yy
4
4
155mm
3
5
510
pp
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Combining Exponents
6
222
32
x
xxxxxxxxx
x
(am)n=?
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Exponent Rules
nmnm aa )(#6
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• (w4)5
• (p-3)4
• (5x4)-2
• (-3y-7)3
nmnm aa )(
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Combining Exponents3
zxy
3
33
zyx
zzzyyyxxx
zxy
zxy
zxy
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Exponent Rules
n
nnn
cba
cab
#7 (distributive rule for exponents)
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n
nnn
cba
cab
432 yx
3
5
2
nm 2
3
465
cba
2475nm
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Exponent Rules
• 1.
• 2.
• 3.
aaaan ....
10 a
nn
aa 1
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Exponent Rules
• 4.
• 5.
• 6.
• 7.
nmnm aaa
nmn
m
aaa
nmnm aa )(
n
nnn
cba
cab