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the curve has a roots of x=-6 and x=8, hence the H=> y=216
hence points A and B have 216 as y cordinate.
method coming up in a short while.
so what is the final answer
l2 has the gradient of -2y/3 and l1 has the gradient of y/6,
the line l1 cut H at 7.5 and l2 at 4.5
the distance between A and B is
that is it?
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