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July 2, 2015

Homework Help: algebra

Posted by Anonymous on Sunday, February 24, 2013 at 6:15pm.

If a rocket is propelled upward from ground level, it's height in meters after t seconds is given by h=-9.8t^2+88.2t. During what interval of time will the rocket be higher than 137.2m?

h=9.8t^2+ 88.2t
I divided both sides by -9.8 which gave me
t^2=-9

But I can't remember what step is next please help. Thanks in advance:-)

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