I just need help with a simple problem thanks! :)

A model rocket is launched from a roof into a large field. The path of the rocket can be modleled by the equation y = -0.8x^2 + 12x + 25.8 where x is the horizontal distance, in meters, from starting point on the roof and y is the height, in meters, of the rocket above the ground.

How far horizontally from its starting point will the rocket land? Round your answer to the nearest hundredth?

Question

I just need help with a simple problem thanks! :)

A model rocket is launched from a roof into a large field.  The path of the rocket can be modleled by the equation y = -0.8x^2 + 12x + 25.8 where x is the horizontal distance, in meters, from starting point on the roof and y is the height, in meters, of the rocket above the ground.

How far horizontally from its starting point will the rocket land?  Round your answer to the nearest hundredth?

jdoe0001 · Answer

|dw:1396991299953:dw|  thus $\bf 0 = -0.8x^2 + 12x + 25.8 $   solve for "x"