Let $0, a, b, c$ be the vertices of a square in counterclockwise order.  Compute
\[\frac{ac + b^2}{ab}.\]Enter your answer in rectangular form.
Question:
Let $0, a, b, c$ be the vertices of a square in counterclockwise order.  Compute
\[\frac{ac + b^2}{ab}.\]Enter your answer in rectangular form.
Answer:
Let's think step by step.

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\frac{3}{2} + \frac{3}{2} i
Let $0, a, b, c$ be the vertices of a square in counterclockwise order.  Compute
\[\frac{ac + b^2}{ab}.\]Enter your answer in rectangular form.
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