Question

Gregory saw that the answer to a problem in his friend’s textbook was 4+2i. This is an example of which type of number?

Answer 1

For this case the first thing you should know is that a complex number is written as follows:
 a + bi
 Where,
 a: real part
 bi: imaginary part
 We note that for this case:
 a = 4
 b = 2
 Obtaining the following complex number:
 4 + 2i
 Answer:
 This is an example of:
 a complex number

Answer 2

A complex number.
Complex number is:
a+bi