Quadratic Equation

2. Find the value of k for which the roots of the quadratic equation (k -4)x2+2(k -4)x +2 = 0 are equal.
4. a polynomial of degree 2
6. Square root of a negative number
8. term for non variable
10. discriminant is less than 0 when
12. is the second element in an ordered pair
15. A polynomial with three unlike terms
16. polynomial, which has only one term
18. Zero are also called
19. an unknown term

1. A shopkeeper buys a number of books for Rs 80. If he had bought 4 more books for the same amount, each book would have cost him Re 1 less. How many books did he bought?
3. The sum S of first n natural numbers is given by S=n(n + 1)/n . Find n, if the sum is 351.
5. the expression b2−4ac is called the
7. known as the "x" coordinate of a point, shown on the horizontal line,
9. how many terms are there in quadratic equation
10. A two digit number is such that the product of the digits is 18. When 63 is subtracted to the number, then the digits interchange their places. Find the number.
11. a polynomial with only 2 terms
13. discriminant is more than 0 when
14. U-shaped plane curve
17. in a flight of 600 Km, an aircraft was slowed down due to bad weather. Its average speed for trip was reduced by 200 Km/h and the time increased by 30 minutes. Find the duration of flight.