Complex Numbers And Quadratic Equations question 432

Question: If $ z_1=1-i $ and $ z_2=-2+4i $ , then $ Im( \frac{z_1z_2}{z_1} )= $

Options:

1

2

3

4

Show Answer

Answer:

Correct Answer: D

Solution:

If $ z_1=1-i $ and $ z_2=-2+4i $ Then $ \frac{z_1z_2}{z_1}=z_2=-2+4i $ Þ $ Im( \frac{z_2}{1} )=4 $ .

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