Lesson Reducing Fractions with Square Roots by Rapalje

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About rapaljer: Retired Professor of Mathematics from Seminole State College of Florida after 36 years.

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5.05   Reducing Fractions with Radicals

           from Basic Algebra: One Step at a Time © 2002-2011

P. 431-434

Dr. Robert J. Rapalje

Seminole State College of Florida

 

ANSWERS TO ALL EXERCISES ARE INCLUDED AT THE END OF THIS PAGE

Radicals often occur within fractional expressions.  When this occurs, it is important to know whether or not the expression may be reduced.  There are no new principles in this section.  The same rules from the chapter on algebraic fractions still apply here.  It is just that somehow they look different until you get used to them.  Compare the following examples:

   ALGEBRAIC FRACTIONS                         FRACTIONS WITH RADICALS

1.                                                                  

                                                                                    (Notice that   is not divided out!)

 

 

2.          does not reduce                                  does not reduce

            (Don’t divide out the 5!)                                (Don’t divide out the 5!)

 

 

3.                                                          

            (Don’t combine unlike terms!)                      (Don’t combine unlike terms!)

 

 

4.                               may be factored          

                               and reduced               

                                                                         

 

                                                                               431

 

    

EXERCISES.             Factor and reduce each of the following exercises if possible.

 1.                                   2.                                  3.       

 

 4.                                 5.                                 6.       

 

 

 7.                               8.                               9.      

           

           

           

             __________

 

10.                               11.                                 12.      

   

 

 

                                                                     432

13.                                                                 14.      

                                                                             

 

            __________                                                                __________

 

 

 15.                                                        16.      

___________                                                              ___________    

 

   

___________                                                              ___________ 

    

 

17.                                                              18.      

                                                                            ____________

                                                                     ____________

 

 

             _______________                                                    ____________

 

 

19.                                                             20.      

                                                           ____________

                                                                                 ____________

 

 

              ____________                                                          ____________

 

 

 

                                                                     433

21.                                                           22.                                  

  

 

 

 

 

23.                                                         24.                            

    

          

 

         

                                                                  

25.                                                       26.                                

 

 

 

 

 

 

                                                                      434             

ANSWERS  5.05

 

p. 432 - 434:

 1.  ;   2.  ;   3.  ;   4.  ;   5.  ;   6.  ;   7.  ;   

   8.  ;     9.  ;   10.  ;   11.  ;   12.  ;  13.  ;   

14.  ; 15.  ;  16.  ;  17.  ;  18.   ;   

19.  ;   20.  ;  21.  ;   22. ;   23.  ;   

24.  ;   25.   ;   26.  .

 

 

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Dr. Robert J. Rapalje Altamonte Springs Campus
Contact me at:   rapaljer@seminolestate.edu
Phone number:  NONE Retired!!
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