Solution
= Solution
There is a single point exactly when the <radius> is zero:
$$
\boxed{c=|b|^2,\qquad z=-b}.
$$
Then $|z+b|^2=0$ forces this unique value of the <complex number> $z$.
= Solution
There is a single point exactly when the <radius> is zero:
$$
\boxed{c=|b|^2,\qquad z=-b}.
$$
Then $|z+b|^2=0$ forces this unique value of the <complex number> $z$.