Quadratic Equation

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Across
  1. 1. U-shaped plane curve
  2. 4. the expression b2−4ac is called the
  3. 6. Zero are also called
  4. 7. The sum S of first n natural numbers is given by S=n(n + 1)/n . Find n, if the sum is 351.
  5. 9. a polynomial with only 2 terms
  6. 11. Square root of a negative number
Down
  1. 2. known as the "x" coordinate of a point, shown on the horizontal line,
  2. 3. 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. 5. polynomial, which has only one term
  4. 7. A polynomial with three unlike terms
  5. 8. is the second element in an ordered pair
  6. 10. Find the value of k for which the roots of the quadratic equation (k -4)x2+2(k -4)x +2 = 0 are equal.
  7. 12. 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.