An inflection point needs the concavity to change. For x^4, f” = 12x^2 is positive on both sides of 0, so x = 0 is not an inflection point. One AP Calculus trap in 35 seconds.
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Music: “Clean Soul” and “Easy Lemon” by Kevin MacLeod (incompetech.com), licensed under Creative Commons: By Attribution 4.0
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