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Question
Evaluate: (5xy − 7) (7xy + 9)
Sum
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Solution
(5xy − 7) (7xy + 9) = 5xy (7xy + 9) − 7 (7xy + 9)
= 35x2y2 + 45xy − 49xy − 63
= 35x2y2 − 4xy − 63
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