Answer
$x=4$
Work Step by Step
The vertical asymptote is where the function is undefined, which happens when the denominator is equal to $0$,
Thus, the given function is undefined when $x-4=0$.
This happens when $x=4.$
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 6 - Trigonometric Functions - 6.5 Graphs of the Tangent, Cotangent, Cosecant, and Secant Functions - 6.5 Assess Your Understanding - Page 417: 1
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