Elementary Linear Algebra 7th Edition

Published by Cengage Learning
ISBN 10: 1-13311-087-8
ISBN 13: 978-1-13311-087-3

Chapter 5 - Inner Product Spaces - 5.2 Inner Product Spaces - 5.2 Exercises - Page 245: 19

Answer

(a) $\langle u, v \rangle =15$ (b) $\| u \| =\sqrt{57}$ (c) $\| v \| =5$ (d) $d(u,v)=\sqrt{20}$

Work Step by Step

$u=(-4,3), \quad v=(0,5)$ , (a) $\langle u, v \rangle =3u_1v_1+u_1v_2=0+15=15$ (b) $\| u \| =\sqrt{\langle u, u\rangle}=\sqrt{3u_1^2+u_2^2}=\sqrt{48+9}=\sqrt{57}$ (c) $\| v \| =\sqrt{\langle v, v\rangle}=\sqrt{3v_1^2+v_2^2}=5$ (d) $d(u,v)=\| u-v \|=\| (-4,-2 \|=\sqrt{16+4}=\sqrt{20}$
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