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CaHeK987 [17]
3 years ago
11

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

Mathematics
1 answer:
amid [387]3 years ago
5 0
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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