7. [1/12 Points] DETAILS PREVIOUS ANSWERS LARCALCET7 4.3.025.MI.SA. This question has several parts that must be completed sequentially. If you skip a part of the question, you will not receive any Consider the function below. (x) = -3x + 18x + 8 Exercise (a) Find the critical numbers of f. Step 1 Differentiate /(x) = -3x7 + 18x + 8 with respect to x. F'(x) = -6x + 18 -6r + 18 Step 2 To find the critical numbers, set f'(x) = 0 and solve for x. (Enter your answers as a comma-separated list.) -6x + 18 = 0 Submit Skip (you cannot come back)