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Calculus Homework Please Help!!?

Let f(x)= 1/(7x^2+8). Find the open intervals on which f is concave up (down). Then determine the x-coordinates of all inflection points of f.

1. F is concave up on the intervals ______________

2. F is concave down on the intervals ________________

3. The inflection points occur at x= ____________

Notes: In the first two, your answer should either be a single interval, such as (0,1), a comma separated list of intervals, such as (-inf, 2), (3,4), or the word "none".

In the last one, your answer should be a comma separated list of x values or the word "none".

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