If the equation x2 + 5kx + 16 = 0 has no real roots then
Given the equation x2 + 5kx + 16 = 0 has no real
a = 1 b = 5k c = 16
Thus D = b2 - 4ac < 0
= (5k)2 - 4.1.16 < 0
= 25k2 - 64 < 0
25k2 = 64