An arrow is accidentally shot into the air. The formula y = - 14x2 + 56x + 18 models the arrow's height above the ground, y, in feet, x seconds after it was released. When does the arrow reach its maximum height? What is that height?
keywords: quadratic equations, vertex form
Maximum height is solved by finding the vertex of a parabola. The solution is detailed and well presented. The response was given a rating of "5/5" by the student who originally posted the question.