Question

Please help in complex number

Answer 1

if z1.z2=\[\mathbb{R}(z1.(\bar z \bar 2 ) )\]
z1*z2 =Imaginary of \[z1(\bar z2)\]
z1=2+5i
z2=3+i
then what is \[\sqrt{z1.z2+z1*z2}=\]