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Question
Evaluate :
3x2 + 5xy − 4y2 + x2 − 8xy − 5y2
Sum
Solution
3x2 + 5xy − 4y2 + x2 − 8xy − 5y2
= 3x2 + x2 + 5xy - 8xy − 4y2 − 5y2
= 4x2 − 3xy − 9y2
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Combining like Terms
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