Question

If f(x) = log2 (x + 4), what is f^−1 (3)?

0

2

4

8

Answer 1

@agent0smith

Answer 2

\[3=\log_2x+4\]solve for x

Answer 3

how do you get that? it is the inverse

Answer 4

exactly

Answer 5

but that isnt how you get to the inverse

Answer 6

1/log2 (7)

Answer 7

I know that I need to switch the x and y but that is as far as I got.

Answer 8

just the same, but my method is faster :P

Answer 9

"Inverse" may mean reciprocal, as so x^-1 = 1/x

but it may mean going from ln x to exp(x), for example.

Something is wrong, as none of your options correspond to my thought.

Answer 10

inverse as in inverse function he means