Many people make this common mistake
What is the square root of the square of minus 9?0:00 question
1:21 answer
3:14 functions
6:47 exception
8:22 quadratic
poll
https://www.youtube.com/post/UgkxfAUfjG5x-R0GoscJrVRwwoIMl7jI5Gzy
Multi-valued functions
https://en.wikipedia.org/wiki/Multivalued_function#Concrete_examples
radicals – Square Root as a multi-valued function – Mathematics Stack Exchange
https://math.stackexchange.com/questions/3726882/square-root-as-a-multi-valued-function
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