Sigh! There should really be some quality control on Cody, to save us from stupid problems like this...
The third element of aVec in the the image contained within your problem description does not match the third element of aVec used in the test suite.
Remove the polynomials that have positive real elements of their roots.
01 - Scalar variables
Matlab Basics - Switching Assignments
03 - Matrix Variables 1
06 - Matrix Equations 1
02 - Vector Variables 4
03 - Matrix Variables 2
03 - Matrix Variables 4
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