Question

Which of these is a complex number?

A.

B.

C.

D.

Answer 1

D. 8/3+ sqrt-7/3

Explanation:

Answer 2

option D

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

Explanation:

Given in the question are 4 number

5√1/3 -
`(9)/(√(7) )`

2 -
`(1)/(√(11) )`

9 +
`3\sqrt{(5)/(2) }`

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

A Complex Number is a combination of a Real Number and an Imaginary Number

Example

a + ib

where a is real number

b is imaginary number

i is 'lota' which is √-1

So according to the definition above

`(8)/(3) + \sqrt{(-7)/(3) }` is complex number in which

`(8)/(3)` is real part

`\sqrt{(7)/(3) } √(-1)` =
`\sqrt{(7)/(3) } i` is the imaginary part