Answer
$\Delta x$ will be negative.
Work Step by Step
The spatial separation, $\Delta x$, will be negative because it is measured from left to right. The sign is significant because it tells us the direction on the x-axis of $\Delta x$.
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
Published by
Wiley
ISBN 10:
1-11823-072-8
ISBN 13:
978-1-11823-072-5
Chapter 37 - Relativity - Questions - Page 1144: 2a
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