the open intervals where the function f(x) = - 4x +36x +172x - 1 is concave upward or concave downward. Find any inflection elect the correct choice below and, if necessary, fill in the answer box to complete your choice A. The function has a point of inflection at (Type an ordered pair using integers or fractions. Simplify your answer. Use a comma to separate answers as needed.) O B. The function does not have an inflection point