Solution
= Solution
For $W=X^2Z$, the <F-term scalar potential> is
$$
V=|W_X|^2+|W_Z|^2
=4|X|^2|Z|^2+|X|^4.
$$
Both terms vanish exactly when $X=0$, while $Z$ is arbitrary. Thus the <supersymmetric vacuum>[supersymmetric vacua] form one complex line,
$$
\boxed{X=0,\qquad Z\in\mathbb C,\qquad V_{\rm vac}=0}.
$$