you throw a ball upward. its height h in feet after t seconds can be modeled by the function h=-16t^2+30t+6.after how many seconds will it hit the ground
When the ball hit the ground, the height will be equal to "0". h=0 Then:
-16t²+30t+6=0
we have to solve this square equation:
t=[-30⁺₋√(900+384)] / (-32) t=(-30⁺₋√1284)/(-32) we have two solutions: t₁=(-30-√1284)/(-32)=2.06 t₂=(-30+√1284)/(-32)=-0.18 This solution is not valid.
