solving a word problem using a quadratic equation with irrational roots

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Question description

could you help me set it up to get the right number for the square root cause i got -751 with positive 38 but with -38 i got 769 i confuse my signs when im supposed solve the 4*ac part

A ball is thrown from a height of 


 meters with an initial downward velocity of 


. The ball's height 


 (in meters) after 


 seconds is given by the following.


How long after the ball is thrown does it hit the ground?Round your answer(s) to the nearest hundredth.

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