Is a fifth order system stable, neutral, or unstable if its transfer function has poles -7[+-]3j and -2[+-]4j
[+-] : means plus or minus for clarification
by 
ANSWERS: 1
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When determining if a fifth order system is stable, neutrally stable or unstable given the poles in the form of A[+-]Bj and C[+-]Dj as given above. If A+B, A-B, C+D and C-D are all positive, then the system is stable. If one of these is negative, it is unstable. Lastly, if exactly two of these are negative, it is neutrally stable. In this case: A+B=-4, A-B=-10, C+D=2, C-D=-6. -4, -10, 2 ,-6. Therefore, since one and only one of the outputs is negative; the system is unstable.
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