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If $l x^{2} + 3 x y - 2 y^{2} - 5 x + 10 y + k = 0$ represents a pair of perpendicular lines, then

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An Intiative by Sri Chaitanya

$k = \pm 3, l = \pm 7$

$k = - 12, l = 2$

$k = 3, l = 15$

$k = 15, l = 9$

answer is B.

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$a + b = 0, Δ = 0$ l

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