Mathematics 9709 · AS & A Level · Complex numbers

Complex numbers — practice question

(main)[5]

Determine the complex number $z$ that satisfies the equation $$\frac{z - 3i}{z + 3i} = \frac{2 - 9i}{5}.$$ Write your answer in the form $x + iy$, where $x$ and $y$ are real.

Worked solution & mark scheme

This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: Substitute $z=x+iy$ to produce an equation with no $xy$ terms.

  • Full mark scheme, point by point
  • Step-by-step worked solution
  • Write your answer & get it marked instantly by AI