What is Log Base 2 of 4?

The below is the work with steps to find what is log base 2 of 4 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 = 4
b = 2

Solution:
y = log₂ 4
= log₂ 2²
= 2 log₂ 2 = 2 x 1
log₂ 4 = 2
log₂(4) = 2