By looking at the complete array, we observe that there is no sign change in the elements of first
column and hence there is no root of the characteristic equation with positive real part.
Solving the auxiliary equation, the roots are evaluated as follows:
3s
2
+ 15 = 0
or s
2
= -5 or
sj
=±5
Hence two roots lie on the imaginary axis of the s-plane. Hence the system is limitedly stable.
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