Question:
If
$\frac{(1+i)^{2}}{2-i}=x+i y$, , then find the value of $x+y$
Solution:
According to the question,
We have,
$x+i y=\frac{(1+i)^{2}}{2-i}$
$=\frac{1+2 i+i^{2}}{2-i}$
$=\frac{2 \mathrm{i}}{2-\mathrm{i}}$
Rationalizing the denominator,
$=\frac{2 \mathrm{i}(2+\mathrm{i})}{(2-\mathrm{i})(2+\mathrm{i})}$
$=\frac{4 \mathrm{i}+2 \mathrm{i}^{2}}{4-\mathrm{i}^{2}}$
$=\frac{4 \mathrm{i}-2}{4+1}$
$=\frac{-2}{5}+\frac{4 i}{5}$
Thus,
$\mathrm{X}=-\frac{2}{5}, \mathrm{y}=\frac{4}{5}$
Hence,
$x+y=-\frac{2}{5}+\frac{4}{5}=\frac{2}{5}$