by HallsofIvy » Mon Sep 07, 2020 4:23 pm
What exactly do you mean by "x1- x2...- x25? Am I correct that each term after the first is subtracted and this is NOT an alternating sum? If so then you have x1- (x2+ ...+ x25)= x1+ (x2+ ...+ x25) so that -(x2+ ...+ x25)= X2+ ...+ X25 and then 2(x2+ ...+ x25)= 0 so x2+ ...+ x25= 0. There is NO "largest possible value" since, if x2+ ...+ x25= 0, x1 can be any number at all.