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

38

meters with an initial downward velocity of

3/ms

. The ball's height

h

(in meters) after

t

seconds is given by the following.

h=38−3t-5t2

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