Rules of exponents pres

Page 1


WHEN MULTIPLYING LIKE BASES, YOU ADD THE EXPONENTS

(a )(a ) = a n

m

n +m

FOR EXAMPLE:

(3 )(3 ) =3 2

5

2 +5

=3

7

NOW YOU TRY:

(4 )(4 ) =4 6

4

6+ 4

=4

10


WHEN RAISING A POWER TO A POWER, YOU MULTIPLY THE EXPONENTS

(a ) n

m

=a

nm

FOR EXAMPLE:

(3 )

4 6

=3

4 *6

=3

24

NOW YOU TRY:

(4 ) 3

5

=4 3*5 =415


ANY INTEGER RAISED TO NEGATIVE ONE IS THE RECIPROCAL OF THAT INTEGER. a

− 1

=

1

a

FOR EXAMPLE: 1 − 1 3 = 3 NOW YOU TRY:

15

−1

1 = 15


Any fraction raised to negative one is the reciprocal of that fraction. a    b 

−1

b = a

FOR EXAMPLE: − 1

2    5 

5 = 2

NOW YOU TRY: −1

9    15 

15 = 9


WHEN DIVIDING LIKE BASES, YOU SUBTRACT THE EXPONENTS. a n  a m 

 n −m  = a  

FOR EXAMPLE:

x  x 

5 3

   =x 

5− 3

=x

2

NOW YOU TRY:

x 12  x 4 

  = 

x

12 −4

=x

8


ANY NUMBER RAISED TO THE FIRST POWER IS ITSELF.

a =a 1

FOR EXAMPLE:

3 =3 1

NOW YOU TRY:

528921 = 528921 1


ANY NUMBER RAISED TO THE ZERO POWER IS ONE.

a =1 0

FOR EXAMPLE:

3 =1 0

NOW YOU TRY:

528921 = 1 0


HOW DO WE GET ANY NUMBER RAISED TO THE ZERO POWER EQUAL TO ONE? 0

a

0

a =1

can be written as

a

1−1

Working backward-you subtract the exponents when you are dividing like bases.

a 1−1

a1 = 1 a

Then any number divided by itself will give you ONE!!!


TRY THESE ON YOUR OWN: −1

1 = 2 x

−4

1 = 8 x

x   3  x  5

x   3  x  5


TRY THESE ON YOUR OWN:

x = 4 y −3

1 3 4 x y

x 3 4 = x y −4 y 3


TRY THIS LAST ONE ON YOUR OWN:

a b a = −5 7 9 a b b 3

−2

8


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