BOB Something i learned this week

Something i learned this week in Pre calc functions was how to combine functions together and find their domains. At first it was a little hard but the more practice I have done, the easier it seemed to be. All it really is is just substituting one function in for the other function's X. Such as: find f(g(x)) f(x)=1x-8 g(x)=1/(x-2). All you have to do is put g(x) into the x value in f(x). So the final equation would be 1(1/(x-2))-8. Then you simplify it, creating 1/(x-2)-8.