Question

Which of the following is the conjugate of a complex number with –4 as the real part and 2i as the imaginary part?

2i – 4
2i + 4
–4 – 2i
4 – 2i

Answer 1

$\overline{-4+2i}=-4-2i$

Answer 2

replace the + 2i by - 2i

so its -4 - 2i