AP7.9 A control system is shown in Figure AP7.9.

Sketch the root loci for the following transfer func

tions G s c( ):

a. G s c( ) = K 

b. G s c( ) = + K s( )

K(s+1) $ +20 K(s+ 1)(s+4) = C. Ge(s)= d. G(s) s+10