-4/9x²+4/3xy+y²

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-4/9x²+4/3xy+y²

-4/9x²+4/3xy+y²
=-4/9(x²-3xy)+y²
=-4/9(x-3y/2)²+2y²
=2y²-4/9(x-3y/2)²
=2y²-(2x/3-y)²
=(√2y-2x/3+y)(√2y+2x/3-y)
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