Quadratic Equation

3. the expression b2−4ac is called the
5. polynomial, which has only one term
7. Find the value of k for which the roots of the quadratic equation (k -4)x2+2(k -4)x +2 = 0 are equal.
8. The sum S of first n natural numbers is given by S=n(n + 1)/n . Find n, if the sum is 351.
11. 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.
12. an unknown term
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. Zero are also called
16. is the second element in an ordered pair
17. a polynomial of degree 2
18. term for non variable

1. A polynomial with three unlike terms
2. a polynomial with only 2 terms
4. Square root of a negative number
6. known as the "x" coordinate of a point, shown on the horizontal line,
8. how many terms are there in quadratic equation
9. 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?
10. U-shaped plane curve
15. discriminant is less than 0 when