Page 1 - 10 Math HA-Solve by Quadratic Formula Ch-4
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SAI International School
                                                      CLASS - X

               Mathematics
               CHAPTER- 4 Quadratic Equations-4

               HOME ASSIGNMENT- 4



               SUBTOPIC : Solving quadratic Equation using quadratic formula


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               1     Using the quadratic formula, solve the equation 9x  + 7x - 2 = 0
               2     A dealer sells a pen for Rs 24 and gains as much percent as the cost price of the
                     pen. Find the cost price of the pen.


                     As x cannot be negative, since it represents cost price, therefore, x = 20
                     Hence, cost price of the pen is Rs 20
               3     The product of Seema''s age five year ago, with her age 9 years later, is 15. Find
                     Seema''s present age.

                     Seema''s present age is 6 years.
               4     Using the quadratic formula, solve the quadratic
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                     equation for x: x + 2ab = (2a + b)x
                     are 2a, b
               5     Solve the quadratic equation






               6     Solve using quadratic formula







                     x = -1,
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               8     Two pipes running together can fill a cistern in 6 minutes If one pipe takes 5
                     minutes more than the other to fill the cistern, find the time in which each pipe w
                     Hence, the time taken by first pipe to fill cistern = 10 min
                     and the time taken second pipe to fill cistern = 15 min                       ould fill the
                     cistern.







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