-4 nswer Formats Type your answers in interval notation. Use -INF and INF to denote ∞ and co. Enter NONE if it is not positive / negative. If there is more than one interval, type your answer as a comma separated list. For example: (a₁, b₁), (a₂, b₂). art 1: The First Derivative d the open interval(s) on which f'(x) is positive/negative. Type your answers using interval notation. ■. f'(z) is positive: f'(x) is negative: art 2: The Second Derivative d the open interval(s) on which f" (z) is positive/negative. Type your answers using interval notation. ■.f"(z) is positive: f"(z) is negative: te: You can click on the graph to enlarge the image. -3 -2 -1 4 3 2 .1 -2 -3 1 2