Question

The stone's height (in meters above the water), I seconds after Ricardo threw it, is modeled by

w(x) = -5(x – 8)(x +4)
How many seconds after being thrown will the stone reach its maximum height?
seconds

Answer 1

Answer: 2 seconds

-5(x-8) (x+4)

x-8=0 or x+4=0

x=8. or x=-4

Now we now the 2 x.

8+ -4/2 = 2 seconds