4-1.Complex numbers
easy

यदि $(x + iy)(1 - 2i)$ का संयुग्मी $1 + i$ हो, तो  

A

$x = \frac{1}{5}$

B

$y = \frac{3}{5}$

C

$x + iy = \frac{{1 - i}}{{1 - 2i}}$

D

$x - iy = \frac{{1 - i}}{{1 + 2i}}$

Solution

(c) दिया है $\overline {(x + iy)(1 – 2i)}  = 1 + i$

 $⇒x – iy = \frac{{1 + i}}{{1 + 2i}} \Rightarrow x + iy = \frac{{1 – i}}{{1 – 2i}}$.

Standard 11
Mathematics

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