use the parameter values a=-3/4, b = 42, c =-81, f=10

i) Find the steady states of the differential equation and determine wheather each one is linearly stable or unstable.

ii) Use the modified parameter vales a=23/28, b=42, c=8, f=10. Determine for all initial values

I have worked out the steady state solution to the differential equation, by setting it equal to zero

on matlab I get

I am however stuck on the second part of this question, dont know how to go about it.?

Any help appreciated.

Thank you.