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

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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