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4. For this problem: recall that you are not allowed the use of a graphing calculator. If a graph appears as if from nowhere and you use it to do this problem you will receive a zero on the entire exam. If you use analytical methods to graph this function that's fine5 but it nmst be completely clear how you produced the graph without using a graphing calculator. If you state the answers without any work I will assume you used a graph generated by using a resource that is not allowed and I will give you a zero on this exam. Let f(.ft') = 2:4 2:332 + 3. (a) [5 points) Find the critical points of f . (b) [4 points) Find the intervals where the function is increasing/ decreasing. Reasoning must be shown. (c) [4 points) Find the intervals where the function is concave up /concave down. Reasoning must be shown. (d) (3 points) Find any local Inaxiina/minima of the function. Explain how you know which is which