Question 1187566
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The solution from the other tutor shows a formal mathematical method for finding the inverse.<br>
The problem says to find the inverse informally... although there is no way to know what that means.<br>
One easy way to find the inverse of a relatively simple function is by using the concept that an inverse function "un-does" what the function does.<br>
To undo what a function does, the inverse function must perform the opposite operations in the opposite order.<br>
For a simple function like this one, finding the inverse function by this method is simple.<br>
The given function performs the following operations on the input:
(1) multiple by 5; and
(2) add 4<br>
The inverse function therefore needs to perform these operations on the input:
(1) subtract 4; and
(2) divide by 5<br>
The inverse function is then<br>
{{{f^(-1)(x)=(x-4)/5}}}<br>