But what if there is something more in the parenthesis such as: If g(x)=x^2-2x find the value? 3[g(x)+4]  

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Plug in the problem for g(x) into where it says g(x) in the second problem. So, 3[x^2-2x + 4]. Than multiply everything inside the brackets by 3. 3x^2-6x+12. And, that should be it.