It depends on the level that you are at.
For more advanced mathematics, the square root of -1 is a number, denoted by i. It is a basic element of complex numbers and is called the imaginary root of -1.
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There are no real answers for a square root of a negative number. Try it on a good scientific calculator (some calculators simply square root the positive, ignoring the negative input), and it should come up with a math error.
"i" is the square root of -1. Since there is no real number whose square is negative, i is an imaginary number.
using basic math principles, you can't find the square root of a negative number because in order for a number to be a square root, you have to multiply it by itself to get your radical. since a negative times a negative and a positive times a positive are both positive, it is impossible to find the square root of a negative number
square root of a negative number is imaginary square root of negative 1 is defined as i square root of negative 144 is sqrt ((144)(-1)) = 12i
Shorthand for "square root" and can also refer to cube root ("third root") etc etc.