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September 22, 2014

September 22, 2014

Posted by **Jessica** on Friday, September 14, 2007 at 11:58pm.

Find the inverese of the one to one function.

9. f(x)=-4x+7

Is the inverese suppose to be

f^-1(x)=x-7/-4?

12. f(x)= square root of x-8

I dont understand how to find the inverese on this one.

16. f(x)= 4/(5x-1)

I dont understand how to find the inverese on this one.

- Inverse of one to one function -
**drwls**, Saturday, September 15, 2007 at 1:04am9. The inverse function gives you x back if the dependent variable is f(x). Call f(x) "y"

y = -4x + 7

x = (1/4) (7-y)

Now you can switch y and x, since it is a "dummy" variable anyway.

f^-1 (x) = (7-x)/4

12. y = (sqrt x) - 8

y+8 = sqrt x

(y+8)^2 = x

f^-1 (x) = (x+8)^2

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