Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

Published by Pearson
ISBN 10: 0-32193-104-1
ISBN 13: 978-0-32193-104-7

Chapter 8 - Polar Coordinates; Vectors - Section 8.5 The Dot Product - 8.5 Assess Your Understanding - Page 636: 19

Answer

$\vec v_1=\frac{5}{2}i-\frac{5}{2}j, \vec v_2=-\frac{1}{2}i-\frac{1}{2}j$

Work Step by Step

1. Let $\vec v_1=ai+bj, \vec v_2=ci+dj$, we have $a+c=2, b+d=-3$ 2. With $v_1\parallel w$, we have $\frac{b}{a}=\frac{-1}{1}$, thus $a=-b$ 3. With $v_2\perp w$, we have $c(1)+d(-1)=0$, thus $c=d$ 4. Combine the above results, we have $-b+d=2$ and $b+d=-3$, thus $d=-\frac{1}{2}$ and $b=-\frac{5}{2}$ 5. Thus the two vectors are $\vec v_1=\frac{5}{2}i-\frac{5}{2}j, \vec v_2=-\frac{1}{2}i-\frac{1}{2}j$
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