What is Log Base 10 of 40?

The below is the work with steps to find what is log base 10 of 40 shows how the input values are being used in the log base 10 functions. Formula:
log_b(x) = y, if b^y = x

Input:
x = 40
b = 10

Solution:
y = log₁₀ 40
= log(10 x 2 x 2)
= log₁₀(10) + log₁₀(2) + log₁₀(2)
= 1 + 0.301 + 0.301
= 1.602
log₁₀(40) = 1.602