multiply 1-x+y by 1+x+y give me the right answer
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Step-by-step explanation:
= 1(1+x+y) -x (1+x+y) + y(1+x+y)
= 1+x+y -x - x² - xy + y + xy + y²
= -x² + y² + 2y + 1
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Answer:
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