Posted by **Rebekah** on Sunday, November 18, 2012 at 8:46pm.

what is the f inverse of f(x)= ln(x-3)

I got y= e^x - 4

Solve

8 times 10^(2x-7)=3

I do not know how to do this. Do i get 8 and 10 with the same base? How?

Thanks!

- Check my precalc -
**Reiny**, Sunday, November 18, 2012 at 10:07pm
f(x) = ln(x-3) or

y = ln(x-3)

first step of find the inverse is to interchange the x and y variables, so the inverse is

x = ln(y-3)

e^x = y-3

y = e^x + 3

2.

8 (10^(2x-7) ) = 3

10^(2x-7) = .375

take log of both sides

log( 10^(2x-7) ) = log .375

(2x-7) log 10 = log .375, remember log 10 = 1

2x - 7 = log .375

x = (7 + log.375)/2 = appr 3.287

## Answer This Question

## Related Questions

- check my precalc - #1. solve x^2-1<0 I got (-1,1) #2 x(x+1) >20 I got (-...
- inverse - find f^-1 (x). (this is asking me to find the inverse) f(x) = -(x-2)^2...
- Math - PreCalc (12th Grade) - Use the inverse matrix to solve this system of ...
- math, algebra II - Can someone explain to me step by step how the book got to ...
- Algebra - Hello, can someone tell me if I got the following solve and check work...
- math! - about finding the inverse of y=(2x+1)/(x+3). should you multiply (x+3) ...
- math,correction - okay for the first one i/ve done it twice and both times i got...
- PreCalc! - sketch a graph whose domain is the interval [0, infinity) but whose ...
- Precalc - Consider the function f(x)=2x^3 +1. Determine whether the inverse of F...
- algebra - - #21 -can you help me solve this equation: 3x^2 (2x - 2) i keep ...

More Related Questions