Question

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

Answer 1

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

=576-208

=368