Being G(s)= -K(s+1)²/s²+2s+2 and K>0 I need a) K value for stability on a closed loop b)sketch the root locus c) the position of the poles on a closed loop for K=1 and for K=2 I have no ideia on how to solve this

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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Being G(s)= -K(s+1)²/s²+2s+2 and K>0 I need
a) K value for stability on a closed loop
b)sketch the root locus
c) the position of the poles on a closed loop for K=1 and for K=2
I have no ideia on how to solve this

 

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