Find the open intervals where the function f(x)=-3x+18x² +175x-3 is concave upward or concave downward. Find any inflection points BEIDE Select 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) B. The function does not have an inflection point