10x²-6xy+y²-4x+6=9x²+x²-6xy+y²-4x+4+2=((3x)²-6xy+y²)+(x²-4x+4)+2=
=(3x-y)²+(x-2)²+2≡>0.
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10x²-6xy+y²-4x+6=9x²+x²-6xy+y²-4x+4+2=((3x)²-6xy+y²)+(x²-4x+4)+2=
=(3x-y)²+(x-2)²+2≡>0.