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Answer 1

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➜ Subtract : 2p(5p-2q+r) from 4p (p-3q+r)

➜ First multiply the terms

➜ 10p² - 4pq + 2pr subtract from 4p² - 12pq + 4pr

➜ 4p² - 12pq + 4pr - 10p² - 4pq + 2pr

➜ Group the like terms

➜ 4p² -10p² - 12pq - 4pq +4pr + 4pr

➜ -6p² -16pq + 8pr

and : 6p² -16pq + 8pr

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