Key rule
log_b(x) = y → x = b^y
For valid inputs, the base must be positive and not equal to 1, and the argument must be positive.
Example
If log_2(x) = 5, then x = 2^5 = 32.
FAQs
What if the base is 10?
Then log_10(x) = y gives x = 10^y.
What if the answer is not exact?
Use a calculator to approximate the result to the desired decimal places.