Find the number of solutions of z2 + |z|2 = 0.
Given:
⇒ z2+|z|2=0
Let us assume z=x+iy
⇒
⇒ x2+(iy)2+2(x)(iy)+x2+y2=0
⇒ 2x2+y2+i2y2+i2xy=0
We know that i2=-1
⇒ 2x2+y2-y2+i2xy=0
⇒ 2x2+i2xy=0
Equating Real and Imaginary parts on both sides we get,
⇒ 2x2=0 and 2xy=0
⇒ x=0 and yR
∴ z=0+iy where yR. i.e, Infinite solutions.