Posted by jennifer on Tuesday, September 30, 2008 at 10:02am.
A toy rocket is launched vertically upward from ground level. This is represented as f(t) = 16t^2 + 128t where t is the time in second and f(t) is the height of the rocket in feet. When will the rocket hit the ground?
divide both sides by 16
0 = 16t^2 + 128t
0 = t^2  8t
0 = t(t8t)
0 = t
0 = t8
add 8 to both sides
8 = t
the rocket will hit the ground in 8 seconds.
can you tell me if I'm correct?

MATH  Qun, Tuesday, September 30, 2008 at 10:44am
Yes, it is right.

MATH  tony, Tuesday, September 30, 2008 at 11:09am
no

MATH  jennifer, Tuesday, September 30, 2008 at 12:24pm
what's wrong with it?
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