Question

Which of the following is a complex number?

Answer 1

C.
`3 \sqrt{ (7)/(5) } + \sqrt{ - (9)/(5) }`

Explanation:

Recall that:

`√( - 1) = i`

For this particular question, you just have to look for the radical containing a negative sign under the square root i.e a negative radicand.

That will be option C.

This is given as

`3 \sqrt{ (7)/(5) } + \sqrt{ - (9)/(5) }`

This can be rewritten to reveal the complex part as:

`3 \sqrt{ (7)/(5) } + \sqrt{ (9)/(5) }i`

Therefore the correct answer us option C