4-1.Complex numbers
easy

જો $(x + iy)(1 - 2i)$ ની અનુબદ્ધ $1 + i$ હોય , તો . . . .

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) Given that $\overline {(x + iy)(1 – 2i)} = 1 + i$
==> $x – iy = \frac{{1 + i}}{{1 + 2i}} \Rightarrow x + iy = \frac{{1 – i}}{{1 – 2i}}$.

Standard 11
Mathematics

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