Question

(Will give medal)
If f(x) = log3 (x + 1), what is f−1(2)?
Answer Selection
A. 1
B. 8
C. 10
D. 27

I will point this out again. I am not asking to do a step by step with you on the comments section to learn to do this. I am on a time crunch, I am looking to get the answer and some of the work. I'm not trying to cheat and just get the answer because I know I will need to learn/master this lesson later. Thanks!

Answer 1

Write it as: y = log3(x+1)
switch x and y:
x=log3(y+1)
solve for y. This is your inverse function.
Once you have that, plug in 2 for x, and calculate the answer.

Small hint to make it easier:
x = log3(y)
solving for y gives:
3^x=y

Answer 2

Have you considered solving: \(2 = \log_{3}(x+1)\)

Answer 3

Thanks for the help but guys please just stop dancing around the answer and answer it already! Please!

Answer 4

I won't do your homework for you, but from what I said, you literally only have 3 steps to find your answer.

Answer 5

No one is dancing. You are to be learning. You have enough information. Use it. I already know how to do it. I won't learn anything by doing it.

Answer 6

It's B.

Answer 7

Thanks a bunch!