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What intervals are y = (x^2+1)/x^2 concave upward?

Mathematics
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How do you determine concavity again?
f(x) * f''(x) <0
elaborate please ?

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Other answers:

f"(x) is the second derivative of f(x), which is the function "y" in your post. I assume you have done or are doing cal 1 (differential calculus)

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