The correct answer, explained.
Re-post from original video with 2 corrections. I misspoke the question as sqrt(4)sqrt(9) and a final line around 8:35 had a stray negative symbol typo. Thanks to @themyief2406, @elishmuel1976, and @arifhossain9751 for alerting me on the original video.
Original video
https://www.youtube.com/watch?v=TC63evkVCYs
https://www.facebook.com/story.php?story_fbid=1161264930567201&id=542971019063265&_rdr
https://brilliant.org/problems/its-not-as-simple-as-you-think
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