Exploring the zeros and nature ofroots of Quadratic Equation

Exploring the roots, zeroes and the nature of solution of quadratic equation
Q.1 I f the discriminant is zero i.e. D=0, How many number of solution does the quadratic equation have? Q.2 How many solution can a quadratic equation have? Q.3 For no solution of quadratic equation what is the condition? Q.4 What is the nature of graph of the quadratic equation when a is positive. Q.5 On changing the slider c what is the change in the graph.