3psilon
What intervals are y = (x^2+1)/x^2 concave upward?



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3psilon
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How do you determine concavity again?

Yahoo!
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f(x) * f''(x) <0

3psilon
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elaborate please ?

mathmate
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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)