if roots of quadratic eq 5xsquare-2kx+20=0 are real and equal then k =
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k = 10 , see the attachment
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Given --> 5x^2 - 2kx + 20 = 0
If the roots are real and equal then D = 0
D = b^2 - 4ac = 0
Here, a = 5 ,b = -2k, c = 20
(- 2k)^2 - 4*5*20 =0
4k^2 - 400 = 0
4k^2 = 400
k^2 = 400/4
k^2 =100
k = 10
If the roots are real and equal then D = 0
D = b^2 - 4ac = 0
Here, a = 5 ,b = -2k, c = 20
(- 2k)^2 - 4*5*20 =0
4k^2 - 400 = 0
4k^2 = 400
k^2 = 400/4
k^2 =100
k = 10
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