Question

Which of the following is the conjugate of a complex number with 2 as the real part and −8i as the imaginary part?

(A. -2+8i; B. 2+8i; C. 2-8i; D.-2-8i)

Answer 1

Hi,

The complex number is

z = a+bi

For a = 2 and b = -8

z = 2+(-8)i
z = 2-8i

The conjugate is

z = a-bi

For a = 2 and b = -8

z = 2-(-8)i
z = 2+8i

Answer:

B. 2+8i