Let f(x) = 3^x-2. Find f(4) ?

Evaluation Exponential Functions

1 Answer
Oct 31, 2017

#9#... or #79#.

Explanation:

Should have written the question more clearly. Since we are replacing #x# with #4# as seen from #f(4)#, we can simply plug #4# into #3^x-2# to be #3^4-2#. This would be equal to #79#.

However, if the equation were written like this, which could be more likely:

#3^(x-2)#

your answer would be #9#, as the exponent would just be #2#, since you are simply taking away #2# from #4#.