Question

Which of the following is a complex number?

A. -7
B. 2 + square root of 3
C. 4 + 9i
D. pi

Answer 1

C 4+9i

Explanation:

A complex number has to have a real and imaginary part.

It is in the form a+bi

A. -7 real

B. 2 + square root of 3 real

C. 4 + 9i real + imaginary = complex

D. pi real