A model rocket is launched from a roof into a large field. The path of the rocket can be modeled by the

equation y = 0.04x + 7.1x + 7.2, where x is the horizontal distance, in meters, from the 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?

2 answers

the rocket is on the ground when y = 0

it seems like one of the x terms should be an x^2 term...
Fix your equation, and then solve for x when y=0
That is when it hits the ground, right?