Graph of the quadratic equation ax2 + bx + c = 0 , with a < 0 , D > 0 is
In the equation ax2 + bx + c = 0 , a is the coefficient of x2. D is disriminant b2 – 4 ac. The value of coefficient of x2 decides whether the graph opens upwards or downwards. The value of discriminant decides the no. of roots of the quadratic equation. D > 0 implies two distinct roots, that is, two separate points of intersection of the curve with the x-axis.