Answer
By substituting $y = 1$, we can disprove the equality between both sides of the equal sign.
Work Step by Step
(a) $$\ln xy = (\ln x)(\ln y)$$ $$\ln x(1) = (\ln x)(\ln 1)$$ $$\ln x \neq 0$$
(b) The graph of $\ln x$ is the only function.
College Algebra (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-32178-228-3
ISBN 13:
978-0-32178-228-1
Chapter 4 - Exponential and Logarithmic Functions - Exercise Set 4.3 - Page 478: 119
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