Answer
$x^2+74$.
Work Step by Step
Plug in $r=x$ into $p(r)$: $p(x)=x^2+5$
Plug in $r=8$ into $p(8)$: $p(x)=8^2+5=64+5=69$
Then $p(r)+p(8)=x^2+5+69=x^2+74$.
Functions Modeling Change: A Preparation for Calculus, 5th Edition
by Connally, Eric; Hughes-Hallett, Deborah; Gleason, Andrew M.; Cheifetz, Phil C.
Published by
Wiley
ISBN 10:
1118583191
ISBN 13:
978-1-11858-319-7
Chapter 2 - Functions - 2.1 Input and Output - Exercises and Problems for Section 2.1 - Exercises and Problems - Page 75: 8
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