In the same way that the square root of 25 can be -5 OR +5,
the square root of -1 is -i or +i.
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The symbol for a a square root sign is: √
The square root sign is called a radical
The name of the tail on the square root sign is the radical.
15 square root sign 5
Its the inside of the parenthisis. Ex: Square root sign ( any number of your choice)