Nothing great will ever be achieved without great men, and men are great only if they are determined to be so. For glory gives herself only to those who have always dreamed of her. – **Charles De Gaulle**

# Lecture - 1 Chapter 4 Quadratic Equations

00:00:30 Meaning and Standard form of Quadratic Equations

00:05:47 NCERT Exercise 4.1 Question 1

00:17:37 NCERT Exercise 4.1 Question 2 part (i) The area of a rectangular plot is 528 m2. The length of the plot (in metres) is one more than twice its breadth. We need to find the length and breadth of the plot.

00:22:00 NCERT Exercise 4.1 Question 2 part (ii) The product of two consecutive positive integers is 306. We need to find the integers.

00:24:27 NCERT Exercise 4.1 Question 2 part (iii) Rohan’s mother is 26 years older than him. The product of their ages (in years) 3 years from now will be 360. We would like to find Rohan’s present age.

00:27:27 NCERT Exercise 4.1 Question 2 part (iv) A train travels a distance of 480 km at a uniform speed. If the speed had been 8 km/h less, then it would have taken 3 hours more to cover the same distance. We need to find the speed of the train.