Question

EXPLAIN OR SHOW HOW TO DO IT.

Answer 1

Answer:

(v) If a complex number z is purely imaginary, then conjugate of z is :

Answer 2

Cross multiply:
X * 5 = 4 * 2

Simplifying
X * 5 = 4 * 2

Reorder the terms for easier multiplication:
5X = 4 * 2

Multiply 4 * 2
5X = 8

Solving
5X = 8

Solving for variable 'X'.

Move all terms containing X to the left, all other terms to the right.

Divide each side by '5'.
X = 1.6

Simplifying
X = 1.6