What should be added to x^2 + y^2 to get x^2 + y^2 + 2 xy?
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Answer:
2xy + 2y^2
Step-by-step explanation:
= x^2+y^2+−x^2+y^2+2xy
= (x^2+ −x^2)+(2xy)+(y^2+y^2)
= 2xy+2y^2
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