Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Chapter 9 - Quadratic Functions and Equations - 9-2 Quadratic Functions - Practice and Problem-Solving Exercises - Page 546: 41


a) .4 seconds b) No--there is still approximately .5 meters before the ball hits the ground.

Work Step by Step

a) $-b/2a = -3.8/2*-4.9 = -3.8/-9.8 = .3878$ $h=-4.9t^2+3.8t+.5$ $h=-4.9*(.3878)^2+3.8*.3878+.5$ $h=-4.9*.15035+1.47347+.5$ $h=-.736715+1.97347$ $h=1.23675$ b) $h=-4.9t^2+3.8t+.5$ $h=-4.9(.3878*2)^2+3.8*(.3878*2)+.5$ $h=-4.9*.6015553+3.8*.7756+.5$ $h=-2.9476209+2.94728+.5$ $h=.49966$
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