Question

If f(x) = log2 (x + 4), what is f^−1(3)?
a.0
B.2
C.4
D.8

Answer 1

Do you know how to find inverse functions?

Answer 2

no

Answer 3

im really lost and my teachers on vacation

Answer 4

hmmm.. well, the gist is to swap the roles of x and y (or x and f(x) in this case)

Answer 5

4

Answer 6

thanks!

Answer 7

\[f^{-1}(3)=x \space when \space f(x)=3\]

Answer 8

\[3=log_2(x+4)\leftarrow\rightarrow 2^3=x+4.\]
Understand?

Answer 9

yes thank you so much!

Answer 10

was we both right?