>> s = tf ('s')

Transfer function:
s

>> gh = (s+5)/((s-6)*(s-3))

Transfer function:
    s + 5
--------------
s^2 - 9 s + 18

>> rlocus(gh)

>> gh = 1/((s-6)*(s-3))

Transfer function:
      1
--------------
s^2 - 9 s + 18

>> rlocus(gh)

>> gh = ((s+5)*(s+6))/((s-6)*(s-3))

Transfer function:
s^2 + 11 s + 30
---------------
s^2 - 9 s + 18

>> rlocus(gh)
>> gh = ((s+5)*(s+6))/((s-6))

Transfer function:
s^2 + 11 s + 30
---------------
     s - 6

>> rlocus(gh)
>> gh = ((s+5)*(s+6))/((s+6))

Transfer function:
s^2 + 11 s + 30
---------------
     s + 6

>> rlocus(gh)
>> gh = ((s+5)*(s+6))/((s+10))

Transfer function:
s^2 + 11 s + 30
---------------
    s + 10

>> rlocus(gh)
>> gh = ((s+5)*(s+6))/((s+10)*(s+19))

Transfer function:
s^2 + 11 s + 30
----------------
s^2 + 29 s + 190

>> rlocus(gh)
>> gh = ((s+5)*(s+6))/((s+10)*(s*s+19))

Transfer function:
     s^2 + 11 s + 30
-------------------------
s^3 + 10 s^2 + 19 s + 190

>> rlocus(gh)

>> gh = ((s+5)*(s+6))/((s+10)*(s*s+19*s+3))

Transfer function:
     s^2 + 11 s + 30
-------------------------
s^3 + 29 s^2 + 193 s + 30

>> rlocus(gh)
>> gh = ((s+5)*(s+6))/((s+10)*(s*s+50*s+3))

Transfer function:
     s^2 + 11 s + 30
-------------------------
s^3 + 60 s^2 + 503 s + 30

>> rlocus(gh)
>> gh = ((s+5)*(s+6))/((s+10)*(s*s+2*s+2))

Transfer function:
    s^2 + 11 s + 30
------------------------
s^3 + 12 s^2 + 22 s + 20

>> rlocus(gh)
>> gh = ((s+5))/((s+10)*(s*s+2*s+2))

Transfer function:
         s + 5
------------------------
s^3 + 12 s^2 + 22 s + 20

>> rlocus(gh)
>> gh = ((s+5)*(s+5)*(s+5))/((s+10)*(s*s+2*s+2))

Transfer function:
s^3 + 15 s^2 + 75 s + 125
-------------------------
s^3 + 12 s^2 + 22 s + 20

>> rlocus(gh)
>> gh = ((s+5)*(s+2)*(s+8))/((s+10)*(s*s+2*s+2))

Transfer function:
s^3 + 15 s^2 + 66 s + 80
------------------------
s^3 + 12 s^2 + 22 s + 20

>> rlocus(gh)
>> gh = ((s+5)*(s+2)*(s+8))/((s+10)*(s*s+2*s+2)(s-2))
??? gh = ((s+5)*(s+2)*(s+8))/((s+10)*(s*s+2*s+2)(s-2))
                                                |
Error: Unbalanced or unexpected parenthesis or bracket.

>> gh = ((s+5)*(s+2)*(s+8))/((s+10)*(s*s+2*s+2)*(s-2))

Transfer function:
    s^3 + 15 s^2 + 66 s + 80
--------------------------------
s^4 + 10 s^3 - 2 s^2 - 24 s - 40

>> rlocus(gh)
>> gh = ((s+5)*(s+3.5)*(s+2)*(s+8))/((s+10)*(s*s+2*s+2)*(s-2))

Transfer function:
s^4 + 18.5 s^3 + 118.5 s^2 + 311 s + 280
----------------------------------------
    s^4 + 10 s^3 - 2 s^2 - 24 s - 40

>> rlocus(gh)