For what values of $x$ is $2x^2+8x\le-6$? Express your answer in interval notation.
Question:
For what values of $x$ is $2x^2+8x\le-6$? Express your answer in interval notation.
Answer:
Let's think step by step.

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For what values of $x$ is $2x^2+8x\le-6$? Express your answer in interval notation.
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