There are two real numbers and infinitely many complex numbers.
Not necessarily. The square root of 4 are +/- 2 which are Real numbers, NOT imaginary. Although, since the Reals are a subset of Complex numbers, the above roots would belong to the Complex numbers.
Only two real numbers but infinitely many complex numbers.
It is +1
Complex numbers are a proper superset of real numbers. That is to say, real numbers are a proper subset of complex numbers.
There are two real numbers and infinitely many complex numbers.
Not necessarily. The square root of 4 are +/- 2 which are Real numbers, NOT imaginary. Although, since the Reals are a subset of Complex numbers, the above roots would belong to the Complex numbers.
Only two real numbers but infinitely many complex numbers.
It is +1
8, and minus 8. If you want to include complex numbers, all numbers on a circle with radius 8.
The answer depends on the numbers under the radical signs. Dpending on their value, the answer will be rational, irrational (real) or complex.
Complex math covers how to do operations on complex numbers. Complex numbers include real numbers, imaginary numbers, and the combination of real+imaginary numbers.
No.
That is called the "absolute value". For example, the absolute value of 5 is 5; the absolute value of -5 is also 5. If you are familiar with complex numbers, the absolute value of 4 + 3i, for example, is also 5.
In the real numbers, 9 and minus 9. In the complex numbers, any number on the unit circle with radius 9.
Complex numbers are a proper superset of real numbers. That is to say, real numbers are a proper subset of complex numbers.
A number to the first power is the number itself.