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February 28, 2015

February 28, 2015

Posted by **CAL** on Wednesday, May 25, 2011 at 12:48pm.

- Algebra -
**MathMate**, Thursday, May 26, 2011 at 8:14amThree steps to inverse:

1. interchange x and y

2. solve y in terms of x

3. evaluate f^{-1}(f(x)) to make sure you get back x.

1. Interchange x and y

Let y=g(x)=3x-5

then

x=3y-5

2. solve for y

y=(x+5)/3

3. evaluate g^{-1}(g(x))

g^{-1}(g(x))

=([3x-5]+5)/3

=(3x)/3

=x OK

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