Find the roots of quadratic polynomial and verify the relationship of roots

Hi,
After a gap of a month, I am back to Steemit and YouTube. I am solving the unsolved NCERT mathematics Books problems.
NCERT books are followed in India for the school children education. These are considered to be the best books. In this video I have solved the problem.1 of exercise 2.2 of NCERT mathematics book of class 10th.