IX Mathematics Chapter 20, Sindh Board. New Mathematics Book. Unit 20 - Theory of Quadratic Equations - Class 10 - Sindh Board and Karachi Board. Exercise 20.7 : Q14, 15. Lecturer: Shaheer Yousuf Khan Time Stamps: 0:12 = Question no. 14 13:56 = Question no. 15 #shaheeryk #yksir #esylearning #merit2excel