MathematicsMedium244×since 2002Q4551Let a,b,ca, b, ca,b,c be any real numbers. Suppose that there are real numbers x,y,zx, y, zx,y,z not all zero such that x=cy+bz,x=cy+bz,x=cy+bz, y=az+cx,y=az+cx,y=az+cx, and z=bx+ay.z=bx+ay.z=bx+ay. Then a2+b2+c2+2abc{a^2} + {b^2} + {c^2} + 2abca2+b2+c2+2abc is equal to :A222B−1-1−1C000D111Check answerSkip