how do I find the inverse function of:

f(x) = 7
------
2x + 4

please, my test is tomrrow. and im studying. but idk how b/c of the fraction.

it's 7 over 2x + 4

so you mean f(x) = 7 / (2x+4) ?

yes

1. replace your y with x's and x with y's
2. solve for your new y by algebraic means
that y= is f^-1(x), the inverse

This post was edited by saber_x3 on Dec 2 2013 12:49am

yes but it doens't make sense

1. y = 7 / 2x + 4
2. x = 7 / 2y + 4
3. (2y+4)(x) = 7
4. 2y + 4 = 7 / x
5. 2y = (7 / x ) - 4
6. y = [( 7 / x) -4 ] / 2


Is this right?

yea
what doesn't make sense?

How do I get to my final answer after step 6?

well, you should replace y with f^-1(x) , which denotes it's the inverse

This post was edited by saber_x3 on Dec 2 2013 12:59am

that mean nothing else than that Step 6 is already your final answer. Controlled the steps by myself they are aight.
Nice explaining by saber_x3 there btw!

This post was edited by Cel on Dec 2 2013 10:17am