College Algebra (10th Edition)

Published by Pearson
ISBN 10: 0321979478
ISBN 13: 978-0-32197-947-6

Chapter 6 - Section 6.4 - Logarithmic Functions - 6.4 Assess Your Understanding: 93

Answer

$x=2$

Work Step by Step

RECALL: $\log_a{x} = y \longrightarrow a^y=x, a\gt0, a\ne 1$ Use the definition above to obtain: $\log_x{4}=2 \\ \longrightarrow x^2=4$ Take the square root of both sides to obtain: $x = \pm \sqrt{4} \\x = \pm \sqrt{2^2} \\x = \pm 2$ Since the base of a logarithm must be positive, $x$ cannot be $-2$. Thus, the only solution to the given equation is $x=2$.
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