For how many positive integer values of $k$ does $kx^2+10x+k=0$ have rational solutions?
Question:
For how many positive integer values of $k$ does $kx^2+10x+k=0$ have rational solutions?
Answer:
Let's think step by step.

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For how many positive integer values of $k$ does $kx^2+10x+k=0$ have rational solutions?
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