Homework Help Forum: Algebra

Posted by Anneliese on Tuesday, November 3, 2009 at 12:23pm.

I have to find the inverse function of f(x)=3-4x. I got y=3-x/4 for the function. I then have to plug it back into the function and verify that it is the inverse. So I wrote (3-4(3-x))/4. This resulted in (-3+x)/4=x. I tried isolating it to get x=x but I just can't get it. Where did I goof up?

• Algebra - bobpursley, Tuesday, November 3, 2009 at 1:09pm

  if g(x) is the inverse of f(x), then f(g(x)) should equal x. You proved that.... f(inverse)=(3-4(3-x))/4=x

  
  

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