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sonuaidalpur:
because when roots are real and equal we put discriminant equal to zero
b square minus 4 AC equal to zero
b square equal to 4 AC
k + 5 whole square equal to 4 X 16 X 25
k + 5 equals to under root 4 x 16 X 25
k + 5 equal to 2 x 4 x 5
k + 5 = 40
k = 40 - 5
k = 35
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