maths in english. exponents and scientific notation
TRANSCRIPT
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Integer Exponents
Powers
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a a a an
n
factors
If a is a real number and n is a positive integer,
a a0 1 0 if
aa
ann
10 if
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4 4 4 43
6 10
41
43
3
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Laws of Exponents
a a a a a ab a b
a
aa
aa
ab
a
bb
m n m n m n mn n n n
m
nm n
n m
n n
n
if
if
10
0
ab
ba
a bn n
if 0 0,
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Write so that all exponents are positive.x y
x y
3 2
1 4
x y
x y
x
x
y
y
3 2
1 4
3
1
2
4
x y3 1 2 4( )
x y4 6 xy
4
6
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3 2 4
3
2x y
x y
Simplify each expression. Express the answer so only positive exponents occur.
3 2 3 4 1 2x y
3 1 3 2x y
3 2 1 2 3 2
x y 3 2 2 6x y x
y
2
69
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From Decimal to Scientific Notation
1. Count the number N of places that the decimal point must be moved in order to arrive at a number x, where 1 < x < 10.
2. If the original number is greater than or equal to 1, the scientific notation is If the original number is between 0 and 1, the scientific notation is
x N10 .
x N 10 .
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Write the number 5,100,000,000 in scientific notation.
51 109.
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Write the number 0.00032 in scientific notation.
3 2 10 4.
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Write as a decimal.4 3 10 5.
0.000043