Quadratic

Q57 ans marked


@AshishSingh
Can you explain what you did
Didnt get the solution

@NishantThakre I made graphs...
First case when a>0
And second when a<0 and observed that from zero to local Minima/Maxima (respectively) there would be 3 roots of a line parallel to y axis
Hence found the set of a for which that is satisfied, then took Complement of that set so that we get set of for which there is unique soln