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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

=sqrt(7.5^2+4.5^2)

=sqrt(76.5)

=8.746

that is it?

yes.

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