

Subject:
Calc: Inverse
Category: Science > Math Asked by: redcapelliragazoga List Price: $7.00 
Posted:
21 Nov 2006 17:09 PST
Expires: 21 Dec 2006 17:09 PST Question ID: 784657 
How do you find the inverse to F(x)=(7x + 3)/(9x  9 )? 

Subject:
Re: Calc: Inverse
Answered By: liviofloresga on 22 Nov 2006 00:11 PST Rated: 
Hi!! You need to isolate x from the equation: y = (7x + 3)/(9x  9) ==> y = (7x + 3)/(9x  9) ==> y*(9x  9) = 7x + 3 ==> 9xy  9y + 7x = 3 ==> 9xy + 7x = 3 + 9y ==> x*(9y + 7) = 3 + 9y ==> x = (3 + 9y)/(9y + 7) From the above result we have that: G(y) = (3 + 9y)/(9y + 7) is the inverse of the function F. Note that F is undefined at x=1 and G is undefined at y=7/9. See for references the following pages: "Finding the Inverse of a Function: More Examples" http://www.purplemath.com/modules/invrsfcn5.htm "Find Inverse Function (1)  Tutorial": http://www.analyzemath.com/inversefunction/Tutorials.html "Find Inverse Function (2)  Tutorial": http://www.analyzemath.com/inversefunction/Tutorials2.html Search strategy: "inverse function" find I hope this helps you. Feel free to request for a clarification if you need it. Regards, liviofloresga 
redcapelliragazoga
rated this answer:
Thanks sooo much. :) 

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