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adell [148]
3 years ago
6

Which of the following is a complex number?

Mathematics
2 answers:
WARRIOR [948]3 years ago
8 0

Complex numbers emerge when you take the square root of a negative number, since the imaginary unit i is defined by the relation i^2=-1, which implies \sqrt{-1}=i

The only option involving the square root of a negative number is the last one.

andrey2020 [161]3 years ago
6 0

Answer:

option D

Step-by-step explanation:

Complex number is a number that has negative under the square root.

Square root (-1) =i is a complex number

square root of a negative number is a complex.

First option does not have any negative number under the square root so it is not a complex.

second option also not have negative number under square root . So it is not a complex

third option have positive 7 under the square root so it is not a complex

Fourth option have -9/5 under the square root . So it is a complex number

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