Properties of a quadratic function

Investigate the properties of a quadratic function of the form
NB: Start with , and 1: Why is the function initially a straight line? 2: Leave and adjust the value of . What happens to the function? 3: Leave and adjust the value of . Does anything appear to happen to the function? 4: Adjust the value of to be positive. How did the function change? Why is it not a straight line? 5: Adjust the value of to be negative. How did the function change compared to 4? 6: Describe the effect that has on the function. 7: Ensure that is NOT equal to . 8: Adjust the value of . How does the function change? 9: Adjust the value of . How does the function change? Give two differences in the way the function changes compared to when you adjusted . 10: Identify the turning point of the function. Adjust the values of and . How do they relate to the turning point? 11: Describe the effect that has on a quadratic function. 12: Describe the effect that has on a quadratic function. 13: Now set . Does the function change as you adjust . Give a reason for your answer.