SOLUTION: For the function defined by f(x)=5x-4, find a formula for f -1(x). Note: the -1 is raised or is in exponent.

Algebra ->  Linear-equations -> SOLUTION: For the function defined by f(x)=5x-4, find a formula for f -1(x). Note: the -1 is raised or is in exponent.       Log On


   

Question 46914: For the function defined by f(x)=5x-4, find a formula for f -1(x).
Note: the -1 is raised or is in exponent.
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
f(x)=5x-4, find a formula for f^-1(x).
Write the problem as y=5x-4
Interchange x and y to get:
x=5y-4
Solve for y as follows:
y=(x+4)/5
That is the inverse of f or f^-1(x).
Cheers,
Stan H.