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That is a number known as "i" - also known as the "imaginary unit". For more information, you may want to investigate about the so-called "complex numbers". The Wikipedia article on complex numbers may be a good starting point.

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Q: What is the value for root -1?
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Why the value of square root is 1divided by 2?

0.5


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You mean the value of the root node? Yes, we can.


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The square root of 0.8 does not have an exact value. So the question is based on false premises.


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The cube root for a real number is the value that when multiplied by itself three times produces that number. So that the cube root of B is A where A x A x A = B.Examplesthe cube root of 8 is 2... (2x2x2=8)the cube root of 27 is 3...(3x3x3=27)The special cases are 0 and 1, which are by definition their own roots (square roots, cube roots, etc.) because all powers of 0 and 1 are still the same value, zero or 1.Perfect cubes are numbers that can be cube-rooted into an integer.These include the numbers 0, 1, 8, 27, and so forth.Negative numbers can also be perfect cubes.-1x-1x-1=-1-2x-2x-2=-8-3x-3x-3=-27For non-perfect cubes, the root includes a repeating decimal requiring rounding.


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