Question

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

Answer 1

You need to find the inverse of log 2 (x+4)....

Answer 2

Okay

Answer 3

How do I do that? @nelsonjedi

Answer 4

So if we make f(x) = y what would our inverse equation look like?

Answer 5

Um... I know i have to set it equal to y and then switch x and y, then solve for y.... but I don't know how because of the "log" part.

Answer 6

Inverse: Step one make f(x) = y so our equation now looks like y= log2(x+4)..correct?

Answer 7

Yes

Answer 8

Right..now switch the x and y and what will it look like?

Answer 9

then x=log2(y+4) ?

Answer 10

then x-4/log2=y ???

Answer 11

??

Answer 12

Hold on..

Answer 13

Okay

Answer 14

Now you need to convert the equation from a logarithmic equation to an exponential equation

Answer 15

Uh-oh..

Answer 16

I really have to finish this... almost dinner. lol