Discussion





The following discussion and solution provided for an earlier submission

should give you enough information to solve this one yourself.





A few words about function notation.  If f is a function, then f(x) is the

value of the function at x, usually denoted by some sort of rule for finding

the value of the function given that you know the value of x.  f(a) would be

the value of the function at a, and f(4) would be the value of the function at,

yep, you guessed it, 4.







Solution





In this case the value of the function f at x, or f(x) is given by the rule:

.  You want to know f(4), which is the value of the function at

4, so 



 

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