Question

Can anyone help with this please? See attachment.

Answer 1

I've already had an attempt but it doesn't feel right.

Answer 2

z1= 2+j2 , z2=1+j5 , z3=j6

\[y=\frac{1}{2+j2}+\frac{1}{1+j5}+ \frac{1}{j6}\]

\[y=\frac{1}{2+j2} \times \frac{2-j2}{2-j2}+\frac{1}{1+j5} \times \frac{1-j5}{1-j5}+ \frac{1}{j6} \times \frac{-j6}{-j6}\]
\[y=\frac{2-j2}{2^{2}+2^{2}}+\frac{1-j5}{1^{2}+5^{2}}-\frac{j6}{6^{2}}\]

\[y=\frac{2-j2}{8}+\frac{1-5j}{26}-\frac{j}{6}\]

Answer 3

\[y=\frac{2-j2}{8}+\frac{1-j5}{26}-\frac{j}{6}=\frac{26 \times 6 (2-j2) + 8 \times 6 (1-j5) - 8 \times 26 (j)}{8 \times 26 \times 6}\]

Answer 4

from now .. its so easy to complete .. if its not worked with you ,, just notify me ...
you are welcome