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This is an example in the book that I am trying to work.

I am given L(s) = (10(s+10)) / (s(s+3)(s+5))

The transfer function T(s) = 1 / (1+L(s))

Solving for the transfer function I get T(s) = (10(s+10)) / (s^3 + 8s^2 + 25s + 100)

The process of getting the zeros is not shown in the example.

zeros (s+6.5182)(s+.7409+3.8461j)(s+.7409-3.8461j).

I have confirmed the (s+6.5182) in matlab then use synthetic division and quadratic formula to get other roots.

My question is how do i get the first root without using matlab because we are not allowed to use computers on the test.

thanks,

mike

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# Homework Help: Zeros of transfer function

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