Answer
243
Work Step by Step
We know the function is the same as:
$$ -12(x-0)(x-9)$$
Thus, we find the x-coordinate of the maximum:
$$ = \frac{0+(9)}{2} =4.5$$
Plugging this in, the maximum is:
$$=-12(4.5)(4.5-9) = 243$$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 4 Quadratic Functions and Factoring - 4.2 Graph Quadratic Function in Vertex or Intercept Form - 4.2 Exercises - Skill Practice - Page 249: 38
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