Question

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

Answer 1

what's 3 = log_2 (x+4)?

Answer 2

i'm not following

Answer 3

i don't even know how to explain

Answer 4

how about this
f^-1(a) = b means f(b) = a

so if f^-(3) = b, then f(b) = 3

replace b with x, you get f(x) = 3

Answer 5

and f(x) is already given. Just solve for x