What is Log Base 2 of 18?

The below is the work with steps to find what is log base 2 of 18 shows how the input values are being used in the log base 2 functions. Formula:
log_b(x) = y, if b^y = x

Input:
x = 18
b = 2

Solution:
y = log₂ 18
= log(2 x 3 x 3)
= log₂(2) + log₂(3) + log₂(3)
= 1 + 1.585 + 1.585
= 4.17
log₂(18) = 4.17