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Math Help - Point of inflection difficulty

  1. #1
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    Point of inflection difficulty

    I have this graph <(x^2 - 8)/(x + 3)>, and I'm supposed to find the point(s) of inflection. So I used the second derivative test, got 2/(x + 3)^3 But when I put that in my calculator, set to to zero, and tell the calculator to solve for x; it just says 'False'. As if the problem has an undefined answer or something. So now I don't know what to do...is there another way to find points of inflection? Or does that 'False' just mean that there is no points of inflection?
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  2. #2
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    ... that's right. Points of inflection give you a zero second derivative. How big would x have to be here to bring the value of 2/(x+3)^3 down to zero? (!)
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