ryanfootball345 ryanfootball345
  • 11-04-2018
  • Mathematics
contestada

if f(x)=3x-15, then f^-1(x) =
solve for x please

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altavistard
altavistard altavistard
  • 12-04-2018
1.  Replace f(x) with y:  y = 3x - 15
2.  Interchange x and y:  x = 3y - 15
3.  Solve this for y:  3y = x + 15, and y = (x + 15)/3
4.  Replace y with 

   -1                -1
 f   (x):           f   (x) = (x + 15) / 3            (answer)
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