Calculus (3rd Edition)

Published by W. H. Freeman
ISBN 10: 1464125260
ISBN 13: 978-1-46412-526-3

Chapter 12 - Parametric Equations, Polar Coordinates, and Conic Sections - Chapter Review Exercises - Page 638: 6

Answer

$c\left( t \right) = \left( {x\left( t \right),y\left( t \right)} \right) = \left( {3t,9{t^2}} \right)$

Work Step by Step

We may write $x\left( t \right) = 3t$, so that $y\left( t \right) = 9{t^2}$. So, the parametrization is $c\left( t \right) = \left( {x\left( t \right),y\left( t \right)} \right) = \left( {3t,9{t^2}} \right)$ When $t=0$, we have $c\left( 0 \right) = \left( {0,0} \right)$. When $t=1$, we have $c\left( 1 \right) = \left( {3,9} \right)$. Thus, the path $c\left(t\right)$ traces the parabolic arc $y=x^2$ from $\left(0,0\right)$ to $\left(3,9\right)$ for $0 \le t \le 1$.
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