Question

The product (5+i)(5−i) is a real number, 26. What are the factors (5+i) and (5−i) called?

imaginary units**
complex numbers
complex conjugates
imaginary numbers

My answer is A but im not sure if thats right

Answer 1

nope. Try C
i is the imaginary unit.
bi is an imaginary number
a+bi is a complex number
a-bi is the conjugate of a+bi