The number of roots on the equation $2 s^{4} + s^{3} + 3 s^{2} + 5 s + 7 = 0$ that in lie in the right half of s-plane is

zero

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one

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two

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three

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Solution

The correct option is C two
$2 s^{4} + s^{3} + 3 s^{2} + 5 s + 7 = 0$

$∵$ Two sign changs in first column.

$∴$ Two poles in the right half of s-plane.

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