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1 Absolutely Nothing is Allowed Here by flickr user Vicki & Chuck Rogers Restrictions!

3 Rational Expressions Mar 4

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Absolutely Nothing is Allowed Here by flickr user Vicki & Chuck Rogers

Restrictions!

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Simplify the following expressions and state any restriction

a)  4x + 4 8x2 + 8x

b) 4t2 ­ 12t +94t2 ­ 9__

a) factorb) restrictionsc) simplify

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why were they "expressıons"

and not "equatıons" ?

Quick Question

Answer:  Equations equal something

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Operations on Rational Expressions

II Mulitplication

• factor and reduce to simplest form• multiply numerators, then denominators

Remember! Any factor in 

the numerator can reduce 

with any factor in the 

denominator

... follow the same rules as operations on fractions (rational numbers)

6 + 52

a) b)  2x + 32

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Operations on Rational Expressions

II Mulitplication

• factor and reduce to simplest form• multiply numerators, then denominators

Remember! Any factor in 

the numerator can reduce 

with any factor in the 

denominator

... follow the same rules as operations on fractions (rational numbers)

factor out a ­1

a) factorb) restrictionsc) simplify

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Multiplying Rational Expressions

Multiply the numerators

Multiply the denominator

Factor and then divide by the common factors

a) factorb) restrictionsc) simplify

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What are the restrictions?

Sometimes it is easier to factor the expressions first and then multiply the remaining factors.

a) factorb) restrictionsc) simplify

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Division of Rational Expressions

Rational expressions can be divided using the same rules as fractions (Which are rational expressions).

 2     5 3 7÷

Example :

Multiply by the reciprical of the second term

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Example:

8m3        5m2____ ____3n2 6n÷

a) factor

b) restrictions

e) simplify

c) invert

d) additional restrictions(Check for additional restrictions after inverting)

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÷÷

÷Example:

Simplify  x2 ­ x ­20           x2 + 9x + 20____________________x2 ­ 6              x2 ­ 12x + 36            

a) factorb) restrictions

e) simplify

c) invertd) additional restrictions

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Assignment

Page 163

1­4, 5 ­ 42 odd