Answer
Please see step-by-step
Work Step by Step
See page 456, the definition of the logarithmic function.
The logarithm of 1 with base b is a number y,
$y=\log_{b}1$,
such that $b^{y}=1.$
We know from the basic properties of exponentials that $b^{0}=1,$
so,
$y=0$,
$\log_{b}1=0$