what should be added to X square + xy + Y square to obtain 2 X square + 3 x y
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Let the term to be added be 'g'
Then
g+x²+xy+y² = 2x²+3xy
g = 2x²-x²+3xy-xy-y²
g = x²+2xy-y²
Therefore, x²+2xy-y² should be added to x²+xy+y² to obtain 2x²+3xy
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