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 - Page 449: 43


Domain: $x\gt 10$ or $(10, +\infty)$.

Work Step by Step

RECALL: The logarithmic function $f(x) = \log_a{x}$ is defined only when $x \gt 0$. Thus, its domain is $x \gt 0$. This means that the function $f(x) = 3-2\log_5{(\frac{x}{2}-5)}$ is defined only when $\frac{x}{2}-5 \gt 0$. Solve the inequality to obtain: $\frac{x}{2}-5 \gt 0 \\\frac{x}{2}-5+5 \gt 0+5 \\\frac{x}{2} \gt 5$ Multiply 2 on both sides of the equation to obtain: $2(\frac{x}{2}) \gt 2(5) \\x \gt 10$ Thus, the domain of the given function is $x\gt 10$. In interval notation, the domain is $(10, +\infty)$.
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