Functions Modeling Change: A Preparation for Calculus, 5th Edition

Published by Wiley
ISBN 10: 1118583191
ISBN 13: 978-1-11858-319-7

Chapter 3 - Quadratic Functions - 3.2 The Vertex of a Parabola - Exercises and Problems for Section 3.2 - Exercises and Problems - Page 127: 12

Answer

$p(t)=2(t-0.03)^2+0.0982$ Vertex: $(0.03,0.0982)$ Axis of symmetry: $x=0.03$.

Work Step by Step

Factor out the coefficient of $x^2$ and square half of the coefficient of the $x$-term: $(0.06 / 2)^2=0.009$. Adding and subtracting this number after the $x$-term gives $$ \begin{aligned} & p(t)=2 t^2-0.12 t+0.1\\ & p(t)=2\left(t^2-0.06 t+0.05\right) \\ & p(t)=2\left(t^2-0.06 t+0.03^2+0.05-0.03^2\right) \\ & p(t) = 2\left(t^2-0.06 t+0.03^2\right)+2\cdot(0.0491)\\ & p(t)=2(t-0.03)^2+0.0982 \end{aligned} $$ The vertex is $(0.03,0.0982)$ and the axis of symmetry is $x=0.03$.
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