The short answer is "Nothing".
In the complex domain, the number of nth roots of any real number is n.
Every non-negative real number has 2 square roots.
Every real number has 3 cube roots.
Every non-negative real number has 2 real square roots and 2 imaginary ones.
and so on.
So what?
Because in real numbers they are not defined.
The square roots of negative numbers.
They are called real numbers. Negative square roots must be complex numbers.
No. Negative numbers are real but their square roots are not.
The answer will depend on the form of the fourth root. Positive real numbers will have two fourth roots which are real and two that are complex. Complex numbers will have four complex roots. However, none of these can be "simplified" in the normal sense of the term.
The complex roots of an equation is any solution to that equation which cannot be expressed in terms of real numbers. For example, the equation 0 = x² + 5 does not have any solution in real numbers. But in complex numbers, it has solutions.
There are no real square roots of -256. But using complex numbers the square roots of -256 are 16i and -16i.
Negative numbers have no real square roots. In terms of complex numbers, the square roots of 43 are +j6.5574 (rounded) and -j6.5574 (rounded)
Some real numbers - such as √2 - are the roots of polynomials with integer coefficients. These are known as algebraic numbers. Irrational numbers are any real numbers that are not rational.
Negative numbers have no real square roots.-144 has two square roots: 12i and -12i.
Negative numbers do not have "real number" square roots.However, they will have two roots (when using imaginary numbers) as do other numbers, where a root including i(square root of -1) is positive or negative.
The following is a list of the sets of numbers in algebra. It is not comprehensive.Natural numbers (0, 1, 2, 3 ...)Integers = natural numbers and their negative counterparts.Rational numbers = numbers that can be expressed as ratios of two integers - the second being non-zero.Irrational numbers = real numbers that are not rational. Irrational numbers comprise "ordinary" irrational numbers and transcendental numbers. The first are real roots of algebraic equations with rational coefficients, the second, such as pi and e, are not.Imaginary numbers. The square of any real number is not negative. As a result, only non-negative numbers can have real square roots. Imaginary numbers are the square roots of negative real numbers.complex numbers. These are numbers which consist of a real part and an imaginary part.quaternions: an extension of complex numbers.There are also separate parts of algebra dealing with infinite and transfinite numbers.