In Unit 2, you created screencasts to demonstrate your understanding of a variety of concepts. In this activity, you will create screencasts to demonstrate your understanding of quadratic functions. Create screencasts for each of the following. 1. Determine the zeros of f(x) = 2x + 5x -7 using two different strategies. 2. Determine the vertex of f(x) = 62 + 12x + 1 by completing the square. 3. Determine the solution to the linear-quadratic system f(x) = x - 4r + 3 and g(r) = 2r + 1