Question

If a complex number is z is purely real then congurate of z is
1) z
2)-z
3) 0
4) none of these​

Answer 1

Answer:

If z is a complex number and z2+z+1z2−z+1 is purely real then find the value of |z| .

I tried to put z2+z+1z2−z+1=k then solve for z and tried to find |z|, but it gets messy and I am stuck. The answer given is |z|=1

Answer 2

Answer:

cm of n particle system and PV of cm........