83
73
53
23
Correct answer is A
x2 + kx + 169; Perfect square
But, b2 - 4ac = 0, for a perfect square
where a - 1; b = k; c = 169
k2 - 4(1) x 169 = 0
k2 - 649 = 0
k2 = 649
k = √649
k = 83
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