Question

-) Evaluate log381.​

Answer 1

log_3 81 = x

We can write this log expression in exponential form this way: 3^(x) = 81.

So, 3 becomes the base, x becomes the exponent and 81 crosses the equal sign and is isolated.

P.S. If you need to find the answer for x, ask yourself:

 

what number must 3 be raised to in order to get 81?

The obvious answer is x = 4.

Look: 3 x 3 x 3 x 3 = 81

So, log_3 81 = 4