SOLUTION: I don't know if I am putting this in the right area but I need your help I can not do this I have been trying for ever please help me? The height h in feet of an object after t

Question 81421: I don't know if I am putting this in the right area but I need your help I can not do this I have been trying for ever please help me?
The height h in feet of an object after t seconds is given by the function
h=-16t^2+90t+3
How long will it take the object to hit the ground? round your answer to the nearest thousandth.
Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
the object "hits the ground" when it is at height 0 ... so set h=0 and solve for t

... using quadratic formula ...

so t=-0.033 and t=5.658 ... the negative value is unrealistic
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