Consider the function f(x) = x+15x 3. Note: Use the letter U for union. To enter o, type infinity with a lower case i. If the function is never increasing or decreasing, enter NA in the associated response area. increasing: decreasing: 0031- (d) Give the local maximum and minimum values of f (x). Enter your answers in increasing order of the x-value. If there are less than two local extrema, enter NA in the remaining response areas and the corresponding drop-down menu. Include a multiplication sign between symbols. For example, a . f( f( (e) Give the intervals of concavity of f (x). Note: Use the letter U for union. To enter co, type infinity with a lower case i. If the function is never concave upward or concave downward, enter NA in the associated response area. concave upward: concave downward: (f) Give the inflection points of f (x). we seinte of inflection enter NA in the remaining response a