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Question
Subtract: 2x2 - 7xy - y2 from 3x2 - 5xy + 3y2
Sum
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Solution
2x2 - 7xy - y2 from 3x2 - 5xy + 3y2
= (3x2 - 5xy + 3y2) - (2x2 - 7xy - y2)
= 3x2 - 5xy + 3y2 - 2x2 + 7xy + y2
= 3x2 - 2x2 - 5xy + 7xy + 3y2 + y2
= x2 + 2xy + 4y2
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