Quadradic Equation Word Problems - Examples & Practice

The University of Pittsburgh has one of the most beautiful campus buildings in the world, The Cathedral of Learning. A select few are able to go onto the roof and see the stunning views. One student decides to throw a ball to his friend on the ground from on top of the building. If the ball follows the path of $y = -3x^{2}+507$, how far away from the building should his friend be standing? Give the positive solution to $y=0$.