Answer
-28
Work Step by Step
$\textbf{F}= 4\hat{i}-5\hat{j}$
$\textbf{d}=(3-0)\hat{i}+(8-0)\hat{j}= 3\hat{i}+8\hat{j}$
$W= \textbf{F}\cdot\textbf{d}=(4\times3)+(-5\times8)= 12-40= -28$
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305071751
ISBN 13:
978-1-30507-175-9
Chapter 9 - Section 9.2 - The Dot Product - 9.2 Exercises - Page 646: 35
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