Question

OR
Find the value of k for which the equation 2kx²- 40x + 25 = 0 has equal
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Answer 1

Answer:

2kx^2 - 40x + 25 = 0

Here, a=2k,  b=-40, c=25

D = b^2 - 4ac

  =  (-40)^2 - 4(2k)(25)

  =  1600 - 200k

given, D = 0

so,  1600 - 200k = 0

                - 200k = -1600

                   200k = 1600

                         2k = 16

                          k = 16/2

                          k = 8.