How do you find the inverse of $f (x) = x + 4$ $f(x)=x+4$ ?

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Answer 1 · 2015-12-17T00:03:20

$f^{- 1} (x) = x - 4$ $f^-1(x)=x-4$

Write as

$y = x + 4$ $y=x+4$

Switch $x$ $x$ and $y$ $y$ .

$x = y + 4$ $x=y+4$

Solve for $y$ $y$ .

$y = x - 4$ $y=x-4$

This can be also written as

$f^{- 1} (x) = x - 4$ $f^-1(x)=x-4$

How do you find the inverse of f(x)=x+4 f(x)=x+4?