Answer
$$ u= (-3,5).$$
Work Step by Step
$$ u=\overrightarrow{PR}=R-P=(-2,7)-(1,2)=(-3,5).$$
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 13 - Vector Geometry - 13.1 Vectors in the Plane - Exercises - Page 650: 38
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