Question

What is f(9) if f(x)=log3 x?

Answer 1

f(9) = 2

Step-by-step explanation:

To know what if f(9), we need to replace x by 9 on the equation of f(x), so:

`\begin{gathered} f(x)=\log _3x \\ f(9)=\log _39 \end{gathered}`

Then, the logarithm needs the number at which 3 to the power of this number is equal to 9.

Therefore:

`f(9)=\log _39=2`

Because:

`3^2=9`

So, the answer is:

f(9) = 2