Write the equation of the inverse,
Solve for x: log2y = x
Then 'switch' the input and the output.
f −1(x) = log2x
This is the reverse of part (a).
Recall that e is a constant. (It's value is between 2 and 3)
f −1(x) = ex
Be sure to divide both sides by 5 before you solve for x .