Question: Contourplots

Hi!

I have a function in 2 variables - lets make it easy, the function is:

f(beta,c_0) = beta-6*beta*c_0+3*beta*c_0^2

I want to know in which regions this function has positive values and where it is negative. Tried it with the command contourplot, but this is not telling me anything :(.

Hope somebody can help

Thx
 

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