inverse of a function

G

Guest

Guest
I was told to find the inverse of f(x) = 7x, which I did (y = 1/7x).

But then it said to verify that f(f-1(x)) = x and f-1(f(x)) = x. How do you do that?

Thanks!
 
Do you know what the function notation means?

A few examples:

If
f(x) = 3*x + 5

Then
f(5) = 3*5 + 5
f(y) = 3*y + 5
f(m<sup>2</sup>) = 3*m<sup>2</sup> + 5
f(Fred) = 3*Fred + 5
f(f<sup>-1</sup>(x)) = 3*f<sup>-1</sup>(x) + 5
 
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