Note If you are asked for value s give your answer as a single value e g 17 or a comma separated list e g 1 2 3 or NONE If you are asked for an interval give your answer in interval notation pe INF for oo and INF for 0 Consider the function f x x 4x 18x 15 a List the locations the x values of the critical points of f x b List the x values of all local maxima of f x values of local maxima c List the x values of all local mimima of f x values of local minima f List the x values of all the inflection points of f values of inflection points g Use interval notation to indicate where f x is concave up Concave up for a in h Use interval notation to indicate where f x is concave down Concave down for in