Question

Which of the following best describes an imaginary number?

A.)The square root of a positive number
B.)A number that does not exist
C.)The square root of a negative number
D.)A number that is represented with the variable x

Answer 1

The square root of a negative number.  Because anything times itself can't give you a negative answer.  Because a negative times a negative will equal a positive number.  

Answer 2

Answer: Option 'c' is correct.

Explanation:

Imaginary numbers are those numbers which can be shown in the Argand plane in which x - axis represents the real numbers and y-axis represents the imaginary numbers and basically it is the square root of negative numbers.

For example : Square root of -1 = √-1 = i (say iota)

and i² = -1 and i⁴ = 1

Hence, option 'c' is correct.