CPT Review 4/17/01 

 

18 

39.  D 

For what value(s) of x will each expression be undefined?  

x

x

x

x

2

2

4

4

6

+

+

+ −

 

 
 

An expression is undefined when the denominator equals zero.  To solve set the 
denominator equal to zero and solve for x. 

 

(

)(

)

2

or   

  

3

0

2

-

or  x

 

0

3

0

2

3

0

6

2

=

−

=

=

=

+

=

−

+

=

−

+

x

x

x

x

x

x

x

 

 

40.  C 

Which of the following is a factor of both equations?  

5

3

2

5

4

2

2

−

+

−

+

x

x

x

x

 

 
 

 

Factor both equations and compare results 

 

 

(

)( )

1

5

5

4

2

−

+

−

+

x

x

x

x

      

(

)(

)

1

5

2

5

3

2

2

−

+

−

+

x

x

x

x

    The matching factor is (x-1)