√-9 × √ -49 Everyone thought the answer was 21 and got it wrong. Can you do it right?

[@richardking5222]

-21, that is straightforward.

[@Sesquipedalian3]

me before watching the video: "haha you guys are stupid, it's obviously 21i"

[@pandurangaraonimmagadda9966]

3i.7i=21i sqr=-21

[@Allahcc31g]

X = -4

[@agronxhelali1250]

3×7=21😊😊

[@agronxhelali1250]

441🎉🎉😊