Find a nonzero $p$ such that $px^2-12x+4=0$ has only one solution.
Question:
Find a nonzero $p$ such that $px^2-12x+4=0$ has only one solution.
Answer:
Let's think step by step.

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Find a nonzero $p$ such that $px^2-12x+4=0$ has only one solution.
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