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Question

2p²q²-pq+4 and 5+7pq-3p²q²

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Solution

(2 p²q² - pq +4 ) + ( 5 + 7pq - 3 p²q²)

=(2 p²q² - pq +4 + 5 + 7pq - 3 p²q²)

=(2 p²q² - 3 p²q²) + ( 7 pq - pq ) + (4 + 5 )

= - p²q² + 6 pq +9

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