I’m having trouble combing these two power series together, and I’m also not sure about the interval or radius of convergence. I tried writing out the series’s and multiplying their terms but I...

I’m having trouble combing these two power series together, and I’m also not sure about the interval or radius of convergence. I tried writing out the series’s and multiplying their terms but I couldn’t find any patterns. Any help would be greatly appreciated!

Extracted text: I Find the Pouer Serres and its interval .and radii of. convergence F(x) = X. 92