Quadratic Equation

2. the expression b2−4ac is called the
3. an unknown term
4. Zero are also called
9. how many terms are there in quadratic equation
11. Find the value of k for which the roots of the quadratic equation (k -4)x2+2(k -4)x +2 = 0 are equal.
12. A polynomial with three unlike terms
13. 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.
14. polynomial, which has only one term
17. U-shaped plane curve
18. 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.
19. Square root of a negative number

1. term for non variable
5. 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?
6. discriminant is less than 0 when
7. a polynomial of degree 2
8. The sum S of first n natural numbers is given by S=n(n + 1)/n . Find n, if the sum is 351.
10. a polynomial with only 2 terms
15. is the second element in an ordered pair
16. known as the "x" coordinate of a point, shown on the horizontal line,