Question 1183526
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What is written in the post, can be read in several different ways, making the post ambiguous.



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I will assume that the problem is as follows.


        If n>0 and {{{x^(2n)}}} = 4, then find  {{{9(x^(3n))^2}}} - {{{13*(x^2)^(2n)}}}.



If  {{{x^(2n)}}} = 4,  then  {{{9(x^(3n))^2}}} = {{{9*x^(6n)}}} = {{{9*(x^(2n))^3}}} = {{{9*4^3}}} = 9*64 = 576;

                      {{{13*(x^2)^(2n)}}} = {{{13*x^(4n)}}} = {{{13*(x^(2n))^2)}}} = {{{13*4^2}}} = 13*16 = 208.


Therefore, the answer to the problem's question is  576 - 208 = 368.
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