IX Mathematics Chapter 20, Sindh Board. New Mathematics Book. Unit 20 - Theory of Quadratic Equations - Class 10 - Sindh Board and Karachi Board. Exercise 20.6. Complete solutions of all Questions. Lecturer: Shaheer Yousuf Khan Time Stamps: 00:43 = Question no. 1 11:43 = Question no. 2 26:25 = Question no. 3 30:04 = Question no. 4 33:19 = Question no. 5 #shaheeryk #yksir #esylearning #merit2excel