The successful warrior is the average man, with laser-like focus. – **Bruce Lee**

# Lecture - 3 Chapter 4 Quadratic Equations

00:01:06 NCERT Exercise 4.2 Question 6 A cottage industry produces a certain number of pottery articles in a day. It was observed on a particular day that the cost of production of each article (in rupees) was 3 more than twice the number of articles produced on that day. If the total cost of production on that day was ₹ 90, find the number of articles produced and the cost of each article.

00:09:46 NCERT Exercise 4.2 Question 2 Example 1

(i) John and Jivanti together have 45 marbles. Both of them lost 5 marbles each, and the product of the number of marbles they now have is 124. We would like to find out how many marbles they had to start with.

(ii) A cottage industry produces a certain number of toys in a day. The cost of production of each toy (in rupees) was found to be 55 minus the number of toys produced in a day. On a particular day, the total cost of production was ₹ 750. We would like to find out the number of toys produced on that day.

00:21:56 NCERT Exercise 4.3 Question 1 Completing the square method