Factoring Polynomials: Summary and Word Problems

A baseball player is practicing his throwing by throwing as far as he can in front of him. On one throw, the height of the ball is $h(x) = -0.05(x^2-49x-50)$, where $x$ is the distance (in meters) the player is to the point on the ground where the ball is over. How far is the ball from the player when it hits the ground (what positive $x$ value makes $h(x)=0$)?