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    Mike LoongBoong's Avatar
    Mike LoongBoong Posts: 1, Reputation: 1
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    #1

    Aug 10, 2018, 08:46 PM
    Cannot calculate the second derivative to to find the region where the function is co
    f(x) = (1+2x)/(2+x^2) Question: Compute the second derivative and use it to find the region where f(x) is concave and where is convex.
    f''(x) = (4x^3 + 6x^2 - 24x - 4)/(x^2 + 2)^3 I cant find x to f''(x) = 0 so I cant find the region where f(x) is concave or convex.
    Can anyone help me please?
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Aug 13, 2018, 07:21 AM
    I get a different result for f''(x), where the numerator is 2nd order. What do you have for f'(x)? Hint: don't forget to divide both numerator and denominator of f'(x) by any common factors.

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