Given the function $y=x^2+10x+21$, what is the least possible value of $y$?
Question:
Given the function $y=x^2+10x+21$, what is the least possible value of $y$?
Answer:
Let's think step by step.

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Given the function $y=x^2+10x+21$, what is the least possible value of $y$?
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