(goh) = 2(x^1/2)-1
(goh)(9) = 2(9^1/2)-1
= 2(3)-1
= 6-1
= 5
(goh)(9) = 5
When you multiply fractions you want to make them a mixed number then multiply the two top numbers together and then the bottom two together. Basically 6 2/3 would become 20/3 x 5/6... then multiply 5 and 20 together and 3 and 6 together to get 100/18... simplify from there.
To solve this problem you must apply the proccedure shown below:
1. You have the following parent function given in the problem above: 
2. If you want to shift this parent function up six units, you only have the add a
, then, you will obtain the following new function:

Therefore, as you can see, the answer is: 