Answers>Further Mathematics>A Level>Article

z = 50 / (3+4i). What is z in a+bi form?

Multiply by complex conjugate

z = 50 / (3+4i) * (3-4i) / (3-4i)

Rationalise

z = 50 ( 3 - 4i) / 25 = 6 - 8i.

IM

Related Further Mathematics A Level answers

All answers ▸

Find the 4th roots 6

Nishil P. avatarAnswered by Nishil P.

How do I apply mathematical induction to answer questions

Oliver M. avatarAnswered by Oliver M.

Let f(x)=x^x for x>0, then find f'(x) for all x>0.

Michael F. avatarAnswered by Michael F.

How do you show that the centre of a group is a subgroup

Alex R. avatarAnswered by Alex R.