Solve quadratic equations in one unknown both algebraically and graphically.

I am having a problem solving x squared, and do not know how to attempt the graphing:

A.  Solve the following quadratic equations. Make sure to show all your work. Do not use any method (e.g., factoring, completing the square, quadratic formula, graphing) more than twice. Use the graphing method at least once and clearly identify the solutions.
1.  3x2 + 11x - 20 = 0
2.  x2 + 3x - 4 = 0
3.  3x2 - x - 1 = 0

B.  Identify the methods you used to solve each equation in part A.

Note: To demonstrate the graphing method, it is important to demonstrate where the solutions and vertex lie on the graph of the equation.