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

find f(a+h)-f(a)/h for the f (x)= 2x+3x

^{2}

**2. Relevant equations**

f(a+h)-f(a)/h

**3. The attempt at a solution**

f(a+h)-f(a)/h

=2(a+h)-3(a+h)

^{2}-2x+3x

^{2}

=2a+2h-3a

^{2}-3h

^{2}-2a+3a

^{2}

=2h-3h

^{2}/h

that is where i am stuck

help please