Consider the equation below. f(x) = x² x² + 3 (a) Find the interval on which f is increasing. (Enter your answer in interval notation.) (0,00) Find the interval on which f is decreasing. (Enter your answer in interval notation.) (b) Find the local minimum value of f. (c) Find the inflection points. (x, y) = (x, y) = (smaller x-value) (larger x-value) Find the interval on which f is concave up. (Enter your answer in interval notation.) Find the interval on which f is concave down. (Enter your answer in interval notation.)