Algebra 2 (1st Edition)

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



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: $$=-12(4.5)(4.5-9) = 243$$
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