Question 1136338
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            Tutor @MathTherary just explained you how to do it technically.


            I only want to add to it the general approach description:



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<U>First step</U>  :  You calculate  g(1) by substituting x= 1 into the formula for g(x);


<U>Second step</U> :  Then you calculate  f(g(1)) by substituting the found value ( the number)  g(1)  into the given formula for f(x).



Both steps are extremely simple !



It may seem to be complicated, but when you do it one-two times, it becomes trivial !
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