البحث:

https://alnasiry.net/forums/uploaded/2_kd1.jpg

[السلام عليكم ورحمة الله
$\LARGE {\color{DarkBlue} (1-i)^{9}(1+i)^{11}=[(1-i)(1+i)]^{9}(1+i)^{2}}$
${\color{DarkBlue} =2^{9}(2i)=2^{10}i=x+yi}$
${\color{DarkBlue} \Rightarrow x=0,,y=2^{10}}$