https://youtu.be/znWdCBchMHk
2.finding nature of roots
https://youtu.be/d-8hGMGVCNI
3.finding k if nature of roots given level 1 sums video 1
https://youtu.be/4hdmWzoS9z8
4.finding k level 2 sums
https://youtu.be/8rINjrB7owI
5.finding k level 3 sums
https://youtu.be/XOt0_6EOaoc
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