To find the inverse of a function you,
1.) Change f(x) to y
y = 4x + 2
2.) Switch the values of x and y
x = 4y + 2
3.) Solve for y
x = 4y + 2
-2 -2
-----------------
x - 2 = 4y
------ ----
4 4
y = x/4 - 1/2
So, f-1 = x/4 - 1/2
Hope this helped!
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