Answer:
y = - 8 + 2i
Step-by-step explanation:
Substitute x = 2i into the equation, noting i² = - 1
y = (2i)² + 2i - 4
= 4i² + 2i - 4
= 4(- 1) + 2i - 4
= - 4 + 2i - 4
= - 8 + 2i
