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4 years, 3 months ago
4 years, 3 months ago
(x+y)2 = 8+z2
(y+z)2 = 10 + x2
(X+z)2 = 7 + y2
adding all equations
2 x2 + 2 y2 + 2z2 + 2xy + 2zx +2yz = x2 + y2 + z2 + 25
after solutioning this eq
then we have
(X+y+z+)2 = 25
X+y+z = 5
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