could you help me set it up to get the right number for the

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 partA 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-5t2How long after the ball is thrown does it hit the ground?Round your answer(s) to the nearest hundredth.