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.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
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.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
\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.
train