What is Log Base 2 of 20?

The below is the work with steps to find what is log base 2 of 20 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 = 20
b = 2

Solution:
y = log₂ 20
= log(2 x 2 x 5)
= log₂(2) + log₂(2) + log₂(5)
= 1 + 1 + 2.3219
= 4.3219
log₂(20) = 4.3219