Question

Which of the following is a complex number?2+ 34 9i

Answer 1

4+9i, since i is a complex number which is the square root of 1. It is the only solution with i in it.

Answer 2

Option 3 -
`4+9i`

Explanation:

Given : Options in the figure.

To find : Which of the following is a complex number?

Solution :

Complex number is defined as the number which contains real number along with imaginary number.

The complex number is in the form of a+ib.

Now, we determine one by one.

Option 1 - -7

-7 is the real number not complex.

Option 2 -
`2+√(3)`

`2+√(3)` is the real number not complex.

Option 3 -
`4+9i`

`4+9i` is in the form a+ib so it is a complex number.

Option 4 -
`\pi`

`\pi` is the real number not complex.

Therefore, Only option 3 is the complex number.