Question

A small toy rocket is launched from a 30-foot pad. The height (h, in feet ) of the rocket t seconds after taking off is given by the formula h=-3t^(2)-9t+30. How long will it take the rocket to hit the ground?

Answer 1

Explanation:

A small toy rocket is launched from a 30-foot HIGH pad.

The height (h, in feet ) of the rocket ABOVE THE GROUND t seconds after taking off is given by the formula h=-3t^(2)-9t+30

Not sure you have the equation posted correctly, but set h = 0 and solve for t

0 = -3t^(2)-9t+30 Use quadratic Formula with a = -3 b = -9 c = 30

to find t = 2 seconds