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( x - 3 ) · 4 x - 9 x 2 - 6 x + 9 . ( x - 3 ) 1 · 4 x - 9 ( x - 3 ) ( x - 3 ) 4 x - 9 x - 3

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- x 2 - 3 x - 2 x 2 + 8 x + 15 · 4 x + 20 x 2 + 2 x . Factor –1 from the first numerator . - ( x 2 + 3 x + 2 ) x 2 + 8 x + 15 · 4 x + 20 x 2 + 2 x Factor . - ( x + 1 ) ( x + 2 ) ( x + 3 ) ( x + 5 ) · 4 ( x + 5 ) x ( x + 2 ) Multiply . - 4 ( x + 1 ) x ( x + 3 ) = - 4 x - 1 x ( x + 3 ) or - 4 x - 1 x 2 + 3 x

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Practice set a

Perform each multiplication.

a 3 b 2 c 2 · c 5 a 5

c 3 a 2 b 2

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y - 1 y 2 + 1 · y + 1 y 2 - 1

1 y 2 + 1

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x 2 - x - 12 x 2 + 7 x + 6 · x 2 - 4 x - 5 x 2 - 9 x + 20

x + 3 x + 6

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x 2 + 6 x + 8 x 2 - 6 x + 8 · x 2 - 2 x - 8 x 2 + 2 x - 8

( x + 2 ) 2 ( x - 2 ) 2

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Division of rational expressions

To divide one rational expression by another, we first invert the divisor then multiply the two expressions. Symbolically, if we let P , Q , R , and S represent polynomials, we can write

P Q ÷ R S = P Q · S R = P · S Q · R

Sample set b

Perform the following divisions.

6 x 2 5 a ÷ 2 x 10 a 3 . Invert the divisor and multiply . 6 3 x 2 5 a · 10 2 a 3 2 2 x = 3 x · 2 a 2 1 = 6 a 2 x

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x 2 + 3 x - 10 2 x - 2 ÷ x 2 + 9 x + 20 x 2 + 3 x - 4 Invert and multiply . x 2 + 3 x - 10 2 x - 2 · x 2 + 3 x - 4 x 2 + 9 x + 20 Factor . ( x + 5 ) ( x - 2 ) 2 ( x - 1 ) · ( x + 4 ) ( x - 1 ) ( x + 5 ) ( x + 4 ) x - 2 2

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( 4 x + 7 ) ÷ 12 x + 21 x - 2 . Write  4 x + 7  as  4 x + 7 1 . 4 x + 7 1 ÷ 12 x + 21 x - 2 Invert and multiply . 4 x + 7 1 · x - 2 12 x + 21 Factor . 4 x + 7 1 · x - 2 3 ( 4 x + 7 ) = x - 2 3

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Practice set b

Perform each division.

8 m 2 n 3 a 5 b 2 ÷ 2 m 15 a 7 b 2

20 a 2 m n

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x 2 - 4 x 2 + x - 6 ÷ x 2 + x - 2 x 2 + 4 x + 3

x + 1 x - 1

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6 a 2 + 17 a + 12 3 a + 2 ÷ ( 2 a + 3 )

3 a + 4 3 a + 2

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Excercises

For the following problems, perform the multiplications and divisions.

4 a 3 5 b · 3 b 2 a

6 a 2 5

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12 a 3 7 · 28 15 a

16 a 2 5

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18 x 6 7 · 1 4 x 2

9 x 4 14

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16 x 6 y 3 15 x 2 · 25 x 4 y

20 x 5 y 2 3

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27 a 7 b 4 39 b · 13 a 4 b 2 16 a 5

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10 x 2 y 3 7 y 5 · 49 y 15 x 6

14 3 x 4 y

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22 m 3 n 4 11 m 6 n · 33 m n 4 m n 3

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- 10 p 2 q 7 a 3 b 2 · 21 a 5 b 3 2 p

15 a 2 b p q

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- 25 m 4 n 3 14 r 3 s 3 · 21 r s 4 10 m n

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21 a 4 5 b 2 ÷ 14 a 15 b 3

9 a 3 b 2

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42 x 5 16 y 4 ÷ 21 x 4 8 y 3

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39 x 2 y 2 55 p 2 ÷ 13 x 3 y 15 p 6

9 p 4 y 11 x

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14 m n 3 25 n 6 ÷ 32 m 20 m 2 n 3

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12 a 2 b 3 - 5 x y 4 ÷ 6 a 2 15 x 2

6 b 3 x y 4

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24 p 3 q 9 m n 3 ÷ 10 p q - 21 n 2

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x + 8 x + 1 · x + 2 x + 8

x + 2 x + 1

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x + 10 x - 4 · x - 4 x - 1

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2 x + 5 x + 8 · x + 8 x - 2

2 x + 5 x 2

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y + 2 2 y - 1 · 2 y - 1 y - 2

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x - 5 x - 1 ÷ x - 5 4

4 x 1

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a + 2 b a - 1 ÷ 4 a + 8 b 3 a - 3

3 4

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6 m + 2 m - 1 ÷ 4 m - 4 m - 1

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x 3 · 4 a b x

4 a b x 2

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2 a 5 ÷ 6 a 2 4 b

4 a 3 b 3

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21 m 4 n 2 ÷ 3 m n 2 7 n

49 m 3 n

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( x + 8 ) · x + 2 x + 8

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( x - 2 ) · x - 1 x - 2

x 1

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( a - 6 ) 3 · ( a + 2 ) 2 a - 6

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( b + 1 ) 4 · ( b - 7 ) 3 b + 1

( b + 1 ) 3 ( b 7 ) 3

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( b 2 + 2 ) 3 · b - 3 ( b 2 + 2 ) 2

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( x 3 - 7 ) 4 · x 2 - 1 ( x 3 - 7 ) 2

( x 3 7 ) 2 ( x + 1 ) ( x 1 )

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( x - 5 ) ÷ x - 5 x - 2

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( y - 2 ) ÷ y - 2 y - 1

( y 1 )

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( y + 6 ) 3 ÷ ( y + 6 ) 2 y - 6

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( a - 2 b ) 4 ÷ ( a - 2 b ) 2 a + b

( a 2 b ) 2 ( a + b )

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x 2 + 3 x + 2 x 2 - 4 x + 3 · x 2 - 2 x - 3 2 x + 2

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6 x - 42 x 2 - 2 x - 3 · x 2 - 1 x - 7

6 ( x 1 ) ( x 3 )

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3 a + 3 b a 2 - 4 a - 5 ÷ 9 a + 9 b a 2 - 3 a - 10

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a 2 - 4 a - 12 a 2 - 9 ÷ a 2 - 5 a - 6 a 2 + 6 a + 9

( a + 2 ) ( a + 3 ) ( a 3 ) ( a + 1 )

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b 2 - 5 b + 6 b 2 - b - 2 · b 2 - 2 b - 3 b 2 - 9 b + 20

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m 2 - 4 m + 3 m 2 + 5 m - 6 · m 2 + 4 m - 12 m 2 - 5 m + 6

1

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r 2 + 7 r + 10 r 2 - 2 r - 8 ÷ r 2 + 6 r + 5 r 2 - 3 r - 4

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2 a 2 + 7 a + 3 3 a 2 - 5 a - 2 · a 2 - 5 a + 6 a 2 + 2 a - 3

( 2 a + 1 ) ( a 6 ) ( a + 1 ) ( 3 a + 1 ) ( a 1 ) ( a 2 )

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6 x 2 + x - 2 2 x 2 + 7 x - 4 · x 2 + 2 x - 12 3 x 2 - 4 x - 4

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x 3 y - x 2 y 2 x 2 y - y 2 · x 2 - y x - x y

x ( x y ) 1 y

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4 a 3 b - 4 a 2 b 2 15 a - 10 · 3 a - 2 4 a b - 2 b 2

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x + 3 x - 4 · x - 4 x + 1 · x - 2 x + 3

x 2 x + 1

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x - 7 x + 8 · x + 1 x - 7 · x + 8 x - 2

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2 a - b a + b · a + 3 b a - 5 b · a - 5 b 2 a - b

a + 3 b a + b

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3 a ( a + 1 ) 2 a - 5 · 6 ( a - 5 ) 2 5 a + 5 · 15 a + 30 4 a - 20

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- 3 a 2 4 b · - 8 b 3 15 a

2 a b 2 5

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- 6 x 3 5 y 2 · 20 y - 2 x

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- 8 x 2 y 3 - 5 x ÷ 4 - 15 x y

6 x 2 y 4

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- 4 a 3 3 b ÷ 2 a 6 b 2

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- 3 a - 3 2 a + 2 · a 2 - 3 a + 2 a 2 - 5 a - 6

3 ( a 2 ) ( a 1 ) 2 ( a 6 ) ( a + 1 )

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x 2 - x - 2 x 2 - 3 x - 4 · - x 2 + 2 x + 3 - 4 x - 8

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- 5 x - 10 x 2 - 4 x + 3 · x 2 + 4 x + 1 x 2 + x - 2

5 ( x 2 + 4 x + 1 ) ( x 3 ) ( x 1 ) 2

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- a 2 - 2 a + 15 - 6 a - 12 ÷ a 2 - 2 a - 8 - 2 a - 10

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- b 2 - 5 b + 14 3 b - 6 ÷ - b 2 - 9 b - 14 - b + 8

( b 8 ) 3 ( b + 2 )

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3 a + 6 4 a - 24 · 6 - a 3 a + 15

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4 x + 12 x - 7 · 7 - x 2 x + 2

2 ( x + 3 ) ( x + 1 )

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- 2 b - 2 b 2 + b - 6 · - b + 2 b + 5

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3 x 2 - 6 x - 9 2 x 2 - 6 x - 4 ÷ 3 x 2 - 5 x - 2 6 x 2 - 7 x - 3

3 ( x 3 ) ( x + 1 ) ( 2 x 3 ) 2 ( x 2 3 x 2 ) ( x 2 )

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- 2 b 2 - 2 b + 4 8 b 2 - 28 b - 16 ÷ b 2 - 2 b + 1 2 b 2 - 5 b - 3

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x 2 + 4 x + 3 x 2 + 5 x + 4 ÷ ( x + 3 )

( x + 4 ) ( x 1 ) ( x + 3 ) ( x 2 4 x 3 )

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x 2 - 3 x + 2 x 2 - 4 x + 3 ÷ ( x - 3 )

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3 x 2 - 21 x + 18 x 2 + 5 x + 6 ÷ ( x + 2 )

3 ( x 6 ) ( x 1 ) ( x + 2 ) 2 ( x + 3 )

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Exercises for review

( [link] ) If a < 0 , then | a | = .

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( [link] ) Classify the polynomial 4 x y + 2 y as a monomial, binomial, or trinomial. State its degree and write the numerical coefficient of each term.

binomial; 2; 4, 2

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( [link] ) Find the product: y 2 ( 2 y 1 ) ( 2 y + 1 ) .

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( [link] ) Translate the sentence “four less than twice some number is two more than the number” into an equation.

2 x 4 = x + 2

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( [link] ) Reduce the fraction x 2 - 4 x + 4 x 2 - 4 .

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Questions & Answers

calculate molarity of NaOH solution when 25.0ml of NaOH titrated with 27.2ml of 0.2m H2SO4
Gasin Reply
what's Thermochemistry
rhoda Reply
the study of the heat energy which is associated with chemical reactions
Kaddija
How was CH4 and o2 was able to produce (Co2)and (H2o
Edafe Reply
explain please
Victory
First twenty elements with their valences
Martine Reply
what is chemistry
asue Reply
what is atom
asue
what is the best way to define periodic table for jamb
Damilola Reply
what is the change of matter from one state to another
Elijah Reply
what is isolation of organic compounds
IKyernum Reply
what is atomic radius
ThankGod Reply
Read Chapter 6, section 5
Dr
Read Chapter 6, section 5
Kareem
Atomic radius is the radius of the atom and is also called the orbital radius
Kareem
atomic radius is the distance between the nucleus of an atom and its valence shell
Amos
Read Chapter 6, section 5
paulino
Bohr's model of the theory atom
Ayom Reply
is there a question?
Dr
when a gas is compressed why it becomes hot?
ATOMIC
It has no oxygen then
Goldyei
read the chapter on thermochemistry...the sections on "PV" work and the First Law of Thermodynamics should help..
Dr
Which element react with water
Mukthar Reply
Mgo
Ibeh
an increase in the pressure of a gas results in the decrease of its
Valentina Reply
definition of the periodic table
Cosmos Reply
What is the lkenes
Da Reply
what were atoms composed of?
Moses Reply
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Source:  OpenStax, Elementary algebra. OpenStax CNX. May 08, 2009 Download for free at http://cnx.org/content/col10614/1.3
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