find the values of k if the point locus -8 6 on locus x^2/4 y^/4=k
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x^2/4+y^2/4=k;p(-8,6)
(x^2+y^2)/4=k
x^2+y^2=4k
(-8)^2+(6)^2=4k
64+36=4k
100=4k
100/4=k
k=25
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