SOLUTION: Use a quadratic equation and factoring to solve the application. A ball falls from the top of a roof 320 feet above the ground. The formula h= -16t^2 + 16t + 320 described the

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: Use a quadratic equation and factoring to solve the application. A ball falls from the top of a roof 320 feet above the ground. The formula h= -16t^2 + 16t + 320 described the       Log On


   

Question 305470: Use a quadratic equation and factoring to solve the application.
A ball falls from the top of a roof 320 feet above the ground. The formula h= -16t^2 + 16t + 320 described the height of the ball above the ground, h, in feet, t seconds after the fall begins. How long will it take the ball to strike the ground?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
0 = -16t^2 + 16t + 320

0 = t^2 - t - 20

0 = (t + 4)(t - 5)