A simple question most people get wrong

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
   • (small typos, unlisted) A simple question ...  

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