alleryStart learning →The lines given by ax² + 2hxy + by² = 0 are perpendicular if and only if
Ah = 0
Bab = -1
Ch² = ab
Da + b = 0
Answer & Solution
Correct answer: D. a + b = 0
Perpendicular lines have m1m2 = a/b = -1, giving a + b = 0.
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