Inverse of function

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▸ ▸ ▸ ▸ » Inverse of function

antanetj Posts: 1, Reputation: 1

New Member

#1

Aug 9, 2009, 07:18 PM

inverse of function

what is the inverse function of f(x)= 3 + 8x/9

Unknown008 Posts: 8,076, Reputation: 723

Uber Member

#2

Aug 10, 2009, 09:47 AM

To find the inverse of a function, Do as follows:

Let $y = 3 + \frac{8x}{9}$

Make x the subject of formula;

You'll have $y-3 = \frac{8x}{9}$

$9(y-3) =8x$

$\frac{9(y-3)}{8} =x$

Now, replace your y by x and x by f inverse.

$f^{-1}(x) = \frac{9(x-3)}{8}$

Here it is, your inverse function! :)

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