SOLUTION: For the function defined by f(x)=5x-4, find a formula for f^-1(x). This one I tried many ways of finding an answer. My answer is f^-1(x)= 1 divided by 5x-4 but not sure if thats

Algebra ->  Exponential-and-logarithmic-functions -> SOLUTION: For the function defined by f(x)=5x-4, find a formula for f^-1(x). This one I tried many ways of finding an answer. My answer is f^-1(x)= 1 divided by 5x-4 but not sure if thats      Log On


   

Question 44662This question is from textbook Algebra and Trigonometry with Analytic geometry
: For the function defined by f(x)=5x-4, find a formula for f^-1(x). This one I tried many ways of finding an answer. My answer is f^-1(x)= 1 divided by 5x-4 but not sure if thats right. Thanks for checking my answer. This question is from textbook Algebra and Trigonometry with Analytic geometry

Found 2 solutions by OHtutor, Nate:
Answer by OHtutor(16) About Me  (Show Source):
You can put this solution on YOUR website!
I'd say you are correct

Answer by Nate(3500) About Me  (Show Source):
You can put this solution on YOUR website!
f^-1(x) means inverse of that function
f(x) = 5x - 4
y = 5x - 4
x = 5y - 4
x + 4 = 5y
0.2x + 0.8 = y
0.2x + 0.8 = f^-1(x)