How do i write a recursive method to sum x^n + x^(n-1) + x^(n-2)?

I posted a question yesterday about how to find the sum of a recursive method

The post is located here: Recursive method to sum x^0 + x^1 + x^2 + ... +x^n

How do i make a recursive method in reverse.

Ex: x^n + x^(n-1) + x^(n-2) + ... + 3 + 2, + 1

I am having a lot of trouble wrapping my brain around recursive methods and a lot of other resources aren't helping me out. Any help is appreciated. Thanks Everyone!

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