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Question

The value of a0 which will ensure that the polynomial s3+3s2+2s+a0 has roots on the left half of the s-plane is

A
11
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B
9
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C
7
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D
5
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Solution

The correct option is D 5
Characteristic equation
s3+3s2+2s+a0

By RH criteria

For roots Lie on LHP
a0>0
6a03>0
The a0 value should be
0<a0<6
a0=5

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