Find the number of real roots to
\[x^4 - 2x^2 - 7 = 0.\]
Question:
Find the number of real roots to
\[x^4 - 2x^2 - 7 = 0.\]
Answer:
Let's think step by step.

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Find the number of real roots to
\[x^4 - 2x^2 - 7 = 0.\]
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