7. Two functions are defined below. F(x) = 5x + 1
g(x) = x/5 - 1/5
Which presentation best establishes that the functions are inverse functions?

Given:

The two functions are

To find:

The presentation which establishes that the functions are inverse functions.

Solution:

Two functions f(x) and g(x) are inverse of each other, if

We have,

Now,

Similarly,

Since, , therefore, the given functions are inverse of each other.

Hence, the correct option is C.

i think it might be a but you might want a second opinion

(5x-1)^2= (5x)^2-2(5x)×1+(1)^2=25x^2-10x+1