This video explains how to find the square root of a negative number.
How To Simplify Negative Numbers:
https://www.youtube.com/watch?v=wSBxW7LW3DA
Complex Numbers - Basic Introduction:
https://www.youtube.com/watch?v=OQz1ydBcQSA&t=1s
How To Find The Square Root of Large Numbers Mentally:
https://www.youtube.com/watch?v=44lpu2IFZvQ&t=1s
How To Simplify Cube Roots:
https://www.youtube.com/watch?v=VdUNTsf14qs
