In triangle $ABC$, $AB = 5$, $BC = 8$, and the length of median $AM$ is 4.  Find $AC$.
Question:
In triangle $ABC$, $AB = 5$, $BC = 8$, and the length of median $AM$ is 4.  Find $AC$.
Answer:
Let's think step by step.

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\sqrt{39}
In triangle $ABC$, $AB = 5$, $BC = 8$, and the length of median $AM$ is 4.  Find $AC$.
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