Question

已知n为正整数,且x的2n次方=4,求9（x的3n次方）2-13（x2）的2n次方的值

Answer 1

x^2n=4

9(x^3n)^2-13(x^2)^2n

=9*(x^2n)^3-13*(x^2n)^2

=9*4^3-13*4^2

=9*64-13*16

=368