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Graph of quadratic functions

You can change the values of a, b and c by moving the dots on the scroll bar. Explore the changes of the graph when you change the values of a, b and c ! Try to answer the following questions: Q.1 When the values of c changes while a and b keeps unchanged, describe the change of the graph. Q.2 When the values of a changes while b and c keeps unchanged, describe the change of the graph. Q.3 When the values of b changes while a and c keeps unchanged, describe the change of the graph.