This is an integer???

I'll use the idea of an extension field to tackle this problem. I got the problem from a video thumbnail. (Check it out: https://youtu.be/0P6L581BxuI) As usual, I haven't seen the video (yet) so I don't know how my solution compares. You might find a different approach which takes advantage of the connection between these radical expressions and the Golden Ratio. ... https://www.youtube.com/watch?v=FnJJCuQihCo