Question

Algebra 2, logarithms??

Answer 1

If \[f(x)=\log_2 (x+4)\] what is\[f ^{-1}(3)\]
a. 0
b. 2
c. 4
d. 8

Answer 2

@mathstudent55

Answer 3

Replace f(x) with 3 and solve for x.

Answer 4

\(3 = \log_2 (x + 4) \)

Now use the definition of log.

Answer 5

x=4

Answer 6

\(2 ^ 3 = x + 4\)

\(8 = x + 4\)

\(x = 4\)

You are correct.

Answer 7

I have a question on parent functions. I've worked it out and somehow I ended up with g(x)-f(x)=all real numbers.... But that doesn't make any sense at all