What is the square root of -1?

Answer 1

It's actually +i and -i

See:

http://en.wikipedia.org/wiki/Imaginary_unit
.

Answer 2

Even though they are CALLED imaginary, numbers like the square root of -1 as just as "real" as any other numbers. It's just a name that was put on them a long time ago.

On the number line, the square roots of -1 are one unit above and one unit below the zero point.

Answer 3

There is no REAL number that can be multiplied by itself to get -1 (or any negative number for that matter). Therefore, there is no real number solution to this problem.

However, we can use IMAGINARY numbers to represent the square root of any negative number.

In mathematics, i is equal to the square root of -1.

So, the answer to your question is i.

To take it a step further, suppose you want to know the square root of -25.

-25 = 25*-1

We know the square root of 25 is 5, and the square root of -1 is i. Therefore, the square root of -25 is 5i.

Answer 4

The square root of -1 is called ' i ' It is known as complex number

Answer 5

The symbol for the square root of -1 is either i or j, depending on the exact branch of mathematics, physics, or engineering you are dealing with. It has no value that can be directly expressed, since it is not a real number but is the basis of the complex number space. A complex number is the algebraic sum of a real number plus another real number multiplied by i (or j), such a 3+6i or -7892+33j.

Answer 6

The square root of -1 is defined by i^2 = -1
i = sqrt(-1)
i^2 = -1
i^3 = -i
i^4 = 1

Answer 7

If you are a mathematician you call it i. i is by definition the square root of -1. It has all sorts of interesing properties which are actually very useful in Physics and Engineering.
If you are an electrical engineer you call it j, I never figured out why.

Answer 8

It is an imaginary number that is commonly denoted by the letter i in mathematics. Physicists sometimes use the letter j instead.

It doesn't exist in the sense that 'real' numbers exist (like 1, 5.6, pi etc). But it does exist as a mathematical concept and it serves some very useful mathematical purposes.

Answer 9

You can't take the square root of a negative number. However, there is an imaginary letter called "i", idk if u get to it yet..it equals the sqr root of -1. If u didnt study it yet, you'll later on. But in general, you can't take the sqr root of a negative number!

Answer 10

you can't take a square root of a negative number. However, you can use complex number. So sqrt(-1) = i

Answer 11

it is reffered to as the letter "i" for mathmatical purposes but the square root of -1 does not exist. If this is for homework of somekind the answer you should put is "i"