What is Log Base 9 of 72?

The below is the work with steps to find what is log base 9 of 72 shows how the input values are being used in the log base 9 functions. Formula:
log_b(x) = y, if b^y = x

Input:
x = 72
b = 9

Solution:
y = log₉ 72
= log(9 x 2 x 2 x 2)
= log₉(9) + log₉(2) + log₉(2) + log₉(2)
= 1 + 0.3155 + 0.3155 + 0.3155
= 1.9465
log₉(72) = 1.9465