@ 4.1.9 Communication and Thinking 1. Show that the solution to the quadratic equation 12 _ 41 = 4 is the same when solving graphically, factoring, using the quadratic formula, and completing the square. 2. Explain how you can find the solutions to a quadratic equation by looking at its graph. 3. Why does factoring help us solve a quadratic equation? 4. When could we use completing the square to solve a quadratic equation? 5. Compare the methods for finding the solutions of _12 + 51 = 6. Which method would you choose for this particular function? Explain your answer. 6. How can we use the discriminant to determine the number of solutions? Why is this useful