If one of the slopes of the pair of lines $ax^2 + 2hxy + by^2 = 0$ is $n$ times the other, then

Question

$4(n+1)^2 ab = nab$

$4h^2 = (n+1)^2 ab$

$4nh^2 = (n+1)^2 ab$

$4ab = (n+1)^2 h$

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