Show that the equation A^2//(x-a)+B^2//(...

Show that the equation `A^2//(x-a)+B^2//(x-b)+C^2//(x-c)+...+H^2//(x-h)=k` has no imaginary root, where `A ,B ,C ,..... ,Ha n da ,b ,c ,........ ,ha n dk in Rdot`

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