Inequalities



@YouKnowwhere If D < 0, why will it always be positive?

@SarmisthaNag **CASE 1 When a>0 and D<0(no real roots so graph will not touch x axis ), If a positive upward facing parabola and if less than zero than downward **
So in this case for any x graph will give positive value so always positive.
CASE 2 When a <0 and D<0 so downward facing parabola and which will always negative