Question: For a control system with a negative unity feedback and the following open-loop transfer function, which one of the choices, shown in Fig. 3.9 ,

For a control system with a negative unity feedback and the following open-loop transfer function, which one of the choices, shown in Fig. 3.9 , graphically shows the stability area of both open-loop and closed-loop systems?

G(s) = k s3+2s2+2s+k

Figure 3.9

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G(s) = k s3+2s2+2s+k

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