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I have been trying to help my daughter all day long with this but with no luck - we both end up solving it the same way, with an incorrect answer. I would appreciate if someone could help us. Thank you! The assignment is:

x2/3 - 5x1/3 + 6 = 0

 Sep 28, 2015

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 #3
avatar+12530 
+5

Hallo guest

 

laugh

 Sep 28, 2015
 #1
avatar+130516 
+5

x^2/3 - 5x^1/3 + 6 = 0   this will factor as

 

(x^1/3 - 2) (x^1/3  - 3)   = 0    set each factor to 0 and we have

 

x^1/3 - 2 = 0                                   and                     x^1/3 - 3 =  0

 

add 2 to each side                                                  add 3 to each side

 

x^1/3 = 2                                                                          x^1/3 = 3

                                        cube each side

 

x = 2^3   = 8                                                                    x = 3^3   = 27

 

And those are the two solutions

 

 

cool cool cool                                                                         

 Sep 28, 2015
edited by CPhill  Sep 28, 2015
edited by CPhill  Sep 28, 2015
 #2
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+5

Smart! We get it now! Thank you CPhill, appreciate your kind help very much! smiley

 Sep 28, 2015
 #3
avatar+12530 
+5
Best Answer

Hallo guest

 

laugh

Omi67 Sep 28, 2015

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