Question

Which of the following is used to represent complex numbers?
A.
x2 + y
B
C.
bi + 2
D.
a + bi

Answer 1

Answer:  D) a+bi

Where both a and b are real numbers.

In your textbook, you might see $a,b \in \mathbb{R}$ to indicate that they are real numbers.

An example would be 7+13i, where a = 7 and b = 13.