1.

A Hurtwiz polynomial D(s) must satisfy two conditions. One is the polynomial is real when s is real. What is the other condition?

A. Roots of D(s) have real parts which are positive and non-zero
B. Roots of D(s) have imaginary parts which are negative
C. Roots of D(s) have real parts which are either zero or negative
D. Roots of D(s) have real parts which are positive or zero
Answer» D. Roots of D(s) have real parts which are positive or zero


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