add x² -2xy -y² to the result of subtract x²-3y² from 2x²-y²+9
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Answer:
2x2-y2+9-(x2-3y2)
x2+2y2+9
x2-2xy-y2+(x2+2y2+9)
2x2+y2-2xy+9
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1
Answer:
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Step-by-step explanation:
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Answered by
3
Answer:
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Step-by-step explanation:
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