What is the minimum value of the expression $x^2+y^2-6x+4y+18$ for real $x$ and $y$?
Question:
What is the minimum value of the expression $x^2+y^2-6x+4y+18$ for real $x$ and $y$?
Answer:
Let's think step by step.

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What is the minimum value of the expression $x^2+y^2-6x+4y+18$ for real $x$ and $y$?
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