Trigonometry 7th Edition

Published by Cengage Learning
ISBN 10: 1111826854
ISBN 13: 978-1-11182-685-7

Chapter 7 - Section 7.5 - Vectors: An Algebraic Approach - 7.5 Problem Set - Page 405: 41

Answer

\begin{align*} U+V&=(-5,1)\\ U-V&=(-5,-1)\\ 2U-3V&=(-10,-3). \end{align*}

Work Step by Step

We have $U=\langle -5,0\rangle, V=\langle 0,1\rangle.$ First find $U+V$, \begin{align*} U+V=(-5,0)+(0,1)\\ &=(-5+0,0+1)\\ &=(-5,1). \end{align*} Hence, $U+V=(-5,1).$ Then find $U-V$, \begin{align*} U-V&=(-5,0)-(0,1)\\ &=(-5-0,0-1)\\ &=(-5,-1). \end{align*} Hence, $U-V=(-5,-1).$ In the end find, \begin{align*} 2U-3V=2(-5,0)-3(0,1)\\ &=(-10,0)-(0,3)\\ &=(-10-0,0-3)\\ &=(-10,-3). \end{align*}
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