Rhado L.

asked • 12/03/15

f (t)=-8t+80t+600 models the approximate height of an object to seconds after it is launched. How many seconds does take the object to hit the ground?

I have got to the star method part but I am stuck

1 Expert Answer

By:

Mayuran K. answered • 12/03/15

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Is it 
 
-8t^2+80t+600
 
by any chance?
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Rhado L.

Yes 
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12/03/15

Rhado L.

I have got to the star method part and I am completely lost on how to get something to multiply to get -75 and add to get a positive 10
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12/03/15

Mayuran K.

-8t^2+80t+600=0
 
t^2-10t-75=0
 
(t-15)(t+5)=0
 
your answer is 15 seconds
 
and if you look at it the difference between 15 and 5 is 10 you were close.
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12/03/15

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