A model rocket is projected straight upward from the ground level according to the height equation h(t) = -16t2 +192t , where h is the height in feet and t is the time in seconds. what is the maximum height? When will it hit the ground?

You are solving for x here. To solve for x you need to isolate it onto one side of the equation. First multiply -4 into (-6x - 3) to get 24x + 12. Now that you have a simplified equation on both sides, subtract 12 from both sides to get 24x = 0. Because anything multiplied by 0 equals 0, x = 0.