Question

Let x, y ∈R, then x + iy is a purely imaginary number, if ... *

a) x = 0, y ≠ 0

b) x ≠ 0, y = 0

c) x ≠ 0, y ≠ 0

d) x = 0, y = 0

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Answer 1

a) x = 0 , y ≠ 0

The obtained number will be purely imaginary

Answer 2

Answer:

a) x=y & not=0 it is purely imaginary number