Q. 13.
III. Using the quadratic formula, solve the following equations for x: (3 marks each)
Q. 14.
Q. 15.
Q. 16.
IV. Solve the following quadratic equations by completing the square method:
Q. 17.
Q. 18.
V. (6 marks each)
Q. 19. One-fourth of a herd of camels were seen in the forest. Twice the square root of the herd had gone to mountains and the remaining 15 camels were seen on the bank of a river. Find the total number of camels.
Q. 20. A motorboat, whose speed is 
in still water, goes 12 km downstream and comes back in a total time of 3 hrs. Find the speed of the stream.
