Welcome to KH. This is a three needle bind off. It's much nicer than sewing a seam IMO. I think you'll be pleased with the result.
I can't get posting the links to work. Hover over the Free Videos button then click Binding Off. Scroll down the page and you'll find videos for English and Continental styles.
Cheating is an option. . . . Cheaters never win and winners never cheat, but smart knitters who want to retain an iota of sanity do, cheerfully. ~~Kory Stamper