Question

Which of the following is a complex number?
7
2+ 3
4 + 9і
3.14

Answer 1

4 + 9i

Explanation:

4 + 9i is a complex number.

4 is the real part and 9i is the imaginary part.

i stands for √-1.

Answer 2

4+9i

Explanation:

i is an imaginary number