What is Log Base 3 of 81?

The below is the work with steps to find what is log base 3 of 81 shows how the input values are being used in the log base 3 functions. Formula:
log_b(x) = y, if b^y = x

Input:
x = 81
b = 3

Solution:
y = log₃ 81
= log₃ 3⁴
= 4 log₃ 3 = 4 x 1
log₃ 81 = 4
log₃(81) = 4