Question

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

Answer 1

NOTE:
The 2 is small towards the bottom, next to log.
The -1 is small and positioned like an exponent after f.

Answer 2

let y=f(x) then we have y=log2 (x + 4)

to find y-1
we replace x by y and y by x ---> x=log2 (y + 4)
and solve for y

do you know how to solve for y here ?

Answer 3

to multiply 2 and 4?

Answer 4

\[\log _{a}b = x \rightarrow 2^{x} = b\]

Answer 5

\[a ^{x}=b\]
@iPwnBunnies

Answer 6

^^ Right. I didn't mean to giveaway the answer. D:

Answer 7

\[\log _{a}b = x \rightarrow a^{x} = b\]

Answer 8

lol @iPwnBunnies
@mathhelpnow can you use this identity here ?

Answer 9

I'll try, 2 is a, and 4 is b, right?

Answer 10

(y+4) would be b.