Multivariable Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 0-53849-787-4
ISBN 13: 978-0-53849-787-9

Chapter 13 - Vector Functions - 13.2 Exercises - Page 876: 3

Answer

$ a.\quad$ see image $ b.\quad \mathrm{r}^{\prime}(t) =\langle 1,2t\rangle$ $ c.\quad$ see image

Work Step by Step

Parametric equations: $\mathrm{r}(t):\quad\left\{\begin{array}{llll} x=t-2 & \Rightarrow & t=x+2 & *\\ y=t^{2}+1 & & & \end{array}\right.$ Substitute $(*)$ into the equation for y: $y=((x+2)^{2}+1$ a parabola that opens up, with vertex at $(-2,1)$ $b.$ Differentiate $(\displaystyle \frac{d}{dt})$ each component function $\mathrm{r}^{\prime}(t):\quad\left\{\begin{array}{l} x=1\\ y=2t \end{array}\right.$ $\mathrm{r}^{\prime}(t) =\langle 1,2t\rangle$ $c. $ position vector : black$\quad \mathrm{r}(-1)$=$\langle-3,2\rangle$ tangent vector: red$\quad \mathrm{r}^{\prime}(-1)$=$\langle 1,-2\rangle$
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