If the roots of 5x2 - kx + 1 = 0 are real and distinct then
Given that the roots of 5x2 - kx + 1 = 0 are real and distinct
a = 5 b = - k c = 1
D = b2 - 4ac > 0
= ( - k)2 - 4.5.1
= k2 - 20 > 0
k2 > 20
Roots are either 
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If the roots of 5x2 - kx + 1 = 0 are real and distinct then
Given that the roots of 5x2 - kx + 1 = 0 are real and distinct
a = 5 b = - k c = 1
D = b2 - 4ac > 0
= ( - k)2 - 4.5.1
= k2 - 20 > 0
k2 > 20
Roots are either