Tenth Homework Set Answers

1. Here are the first 10 iterates of (a)
  -1.75
  1.3125
  -0.0273437
  -1.74925
  1.30988
  -0.0342048
  -1.74883
  1.30841
  -0.0380725
  -1.74855
The iterates appear to be converging to a 3-cycle, so we deduce c = -1.75 belongs to the Mandelbrot set.
 
Here are the first 10 iterates of (b)
  -0.1 + i
  -1.09 + 0.8 i
  0.4481 - 0.744 i
  -0.452742 + 0.333227 i
  -0.0060647 + 0.698268 i
  -0.587541 + 0.99153 i
  -0.737928 - 0.16513 i
  0.41727 + 1.24371 i
  -1.4727 + 2.03792 i
  -2.0843 - 5.00248 i
By z9 we see the iterates are farther than 2 from the origin. Consequently c = -.1 + i does not belong to the Mandelbrot set.

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