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2017 preRMO p18, x^2+4y^2+16z^2=48, xy+4yz+2zx=24, x^2 + y^2 + z^2 =?

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August 9, 2019
algebrasystem of equations

Problem Statement

If the real numbers x,y,zx, y, z are such that x2+4y2+16z2=48x^2 + 4y^2 + 16z^2 = 48 and xy+4yz+2zx=24xy + 4yz + 2zx = 24, what is the value of x2+y2+z2x^2 + y^2 + z^2?