I have to find the inverse of f(x) = 3x + 7 and then verify f & f-1 are inverses algebraically.
This is how I did it...
f(x) = 3x + 7
y = 3x + 7
x = 3y + 7
x - 7 = 3y
x - 7 = y
3
to do the inverse I solved this way...
f-1(x) = x - 7
3
y = x - 7
3
x = y - 7
3
3x = y - 7
3x + 7 = y
I'm missing something but not sure what. Thanks for the help.
This is how I did it...
f(x) = 3x + 7
y = 3x + 7
x = 3y + 7
x - 7 = 3y
x - 7 = y
3
to do the inverse I solved this way...
f-1(x) = x - 7
3
y = x - 7
3
x = y - 7
3
3x = y - 7
3x + 7 = y
I'm missing something but not sure what. Thanks for the help.