Chapter 12 - Exponential Functions and Logarithmic Functions - 12.3 Logarithmic Functions - 12.3 Exercise Set - Page 802: 4

$1$

For $x\gt 0$ and $a$ = a POSITIVE constant other than 1, $\log_{a}x$ is the exponent to which $a$ must be raised in order to get $x$. The exponent needed to raise a to get a is 1. $a^{1}=a$ ,so $\log_{a}a=1$ Fill the blank with: $1.$