For how many positive integers $x$ is $x^2 + 6x + 9$ between 20 and 40?
Question:
For how many positive integers $x$ is $x^2 + 6x + 9$ between 20 and 40?
Answer:
Let's think step by step.

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For how many positive integers $x$ is $x^2 + 6x + 9$ between 20 and 40?
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