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Quadratic word problems (factored form)

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Problem

Ricardo throws a stone off a bridge into a river below.
The stone's height (in meters above the water), x seconds after Ricardo threw it, is modeled by
w(x)=5(x8)(x+4)
What is the maximum height that the stone will reach?
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
  • an exact decimal, like 0.75
  • a multiple of pi, like 12 pi or 2/3 pi
meters
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