Close-loop TF Calculation

Hello,

I am trying to do a close-loop TF Calculation but I get an error:

Gc=(32.8802(s+3)/s(s+7)(s+8.52))

Gc=(32.8802(s+3)/s(s+7)(s+8.52))

↑

Error: Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise,

check for mismatched delimiters.

CAN YOU HELP TO UNDERSTAND WHAT IS GOING ON? THANK YOUUUUUU!!!

Answer 1

[David Wilson]

You need a few multiplies.

s = tf('s')
Gc= 32.8802*(s+3)/s/(s+7)/(s+8.52)

Now you can perform step or bode or whatever.

[Manuel Robles Villamarin]

THANK YOU!!!!