cal

Find the largest open intervals where the function is concave upward.

f(x)=x^4-8x^2

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  1. f" = 12x^2-16
    f">0 where |x|>2/√3

    That is, (-∞,-2/√3) (2/√3,∞)

    Both those are intervals extending to infinity. Question is ill-posed.

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