Answer
$y=-30(x-8)(x-0.2)$
$k=-30, r=8, s=0.2$
Work Step by Step
We can write
$$
\begin{aligned}
y & =3(0.5 x-4)(4-20 x) \\
& =3(0.5)(x-8)(-20)(x-4 / 20) \\
& =-30(x-8)(x-0.2),
\end{aligned}
$$ with
$k=-30, r=8, s=0.2$
Functions Modeling Change: A Preparation for Calculus, 5th Edition
by Connally, Eric; Hughes-Hallett, Deborah; Gleason, Andrew M.; Cheifetz, Phil C.
Published by
Wiley
ISBN 10:
1118583191
ISBN 13:
978-1-11858-319-7
Chapter 3 - Quadratic Functions - 3.1 Introduction to the Family of Quadratic Functions - Exercises and Problems for Section 3.1 - Exercises and Problems - Page 121: 39
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