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**1. The problem statement, all variables and given/known data**

Let a=fx+g and b=hx+i. For which real numbers f,g,h,i a∘ b = b∘ a

**2. Relevant equations**

**3. The attempt at a solution**

a∘ b(x)=(a(b(x))= h(fx+g)+i= fhx+gh+i

b∘ a(x)=(b(a(x))= f(hx+i)+g= fhx+fi+g

I'm kind of stuck here as I don't think I know what the question is really asking for so I'm unable to proceed :S