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I'm assuming that the question is "Given the function "f(x) = x^3 - 15x", what are the points of inflection?

Points of inflection are the zeros of the 2nd derivative of a function.  For this function, the derivatives are:

f(x) = x^3 - 15x      <- original function
f'(x) = 3x^2 - 15     <- 1st derivative
f''(x) = 6x               <- 2nd derivative

Since the 2nd derivative has only one zero solution of "x = 0", the original function has x=0 as the inflection point.
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